ChatGPT answers, unedited

For a small agency that wants automated migrations, one-click restores, and a smooth client hosting operation, I would not pick a reseller host based only on storage/bandwidth. The key is the management layer: backups, cloning, staging, migrations, client isolation, and automation. Tremhost

My shortlist:

My recommendation by agency type

1. Mostly WordPress brochure sites (5–100 clients)

Pick Cloudways or Kinsta.

Why:

• Clone sites quickly for new builds
• Staging → production workflows
• Easier restores
• Less time dealing with server issues
• Better fit for selling “managed hosting” rather than raw hosting

2. You want to sell hosting packages under your own brand

Pick Verpex + WHMCS/ClientExec.

A typical stack:

• Reseller hosting account
• WHM/cPanel for account separation
• WHMCS or ClientExec for billing/provisioning
• Automated backups
• Migration process documented internally

Traditional reseller platforms often pair with billing automation tools like WHMCS, Blesta, or similar systems. hosting.com ZipDo

3. You want the fewest support headaches

Avoid the cheapest shared reseller plans. They often make migrations and restores a manual process. Your time spent fixing client issues will cost more than the hosting margin.

Features I would require before signing up

• Automated daily backups (preferably off-server)
• One-click full-site restore
• Staging environments
• Site cloning
• Free migration assistance
• Malware scanning
• Client isolation
• API access for automation
• White-label nameservers/control panel
• Ability to upgrade individual high-traffic clients

For a small agency, my default choice would be:

Start: Cloudways if you manage fewer, higher-value sites.
Scale: Move to a true reseller stack (Verpex/Liquid Web + WHMCS) when you have enough recurring hosting clients to justify automation. Hostinglar hostingdive

A useful question: are your clients mostly WordPress sites, WooCommerce stores, or mixed stacks (WordPress + custom apps + email hosting)? That changes the best choice quite a bit.

For a small agency managing client websites, I’d prioritize two separate capabilities:

1. Client-facing automated migrations — ideally the client can initiate a move without opening a support ticket.
2. Self-service restores — clients can restore files/databases/sites themselves, rather than asking you to do it.

My pick: 20i

20i.com is probably the best fit if minimizing operational work is your priority.

Why:

• Its Migration Center can automatically migrate files, databases, and email from cPanel/WHM, Plesk, DirectAdmin, FTP/SFTP, etc. 20i 20i
• It supports automated provisioning and management, so new client hosting can be created without manual intervention. 20i
• It has its own reseller automation/billing system, HostShop, rather than requiring you to assemble everything around WHMCS. 20i
• It exposes a Reseller API, which is particularly useful if you eventually want to build your own agency dashboard or automate client onboarding. 20i

The big caveat: 20i uses its own StackCP control panel rather than the traditional cPanel/WHM stack. If your agency specifically wants cPanel because clients are already familiar with it, I'd choose a different architecture.

Best cPanel-based option: a JetBackup + WHMCS host

If you want the conventional agency stack, I'd look for:

cPanel/WHM + WHMCS + JetBackup

JetBackup is especially strong for your restore requirement. It provides an end-user restore portal and one-click full-account recovery, including files, databases, email, DNS, etc. JetBackup JetBackup cPanel also documents giving resellers access to JetBackup's Restore Wizard. cPanel

WHMCS handles the other side: automated provisioning, account changes, suspension, synchronization, billing, and the client portal. WHMCS

For automated migrations, however, I'd distinguish between "the host will migrate clients for you" and "the client can click a button and migrate themselves." The latter is much less common. There are now WHMCS add-ons such as TivroMigrator that let clients initiate file/database/email migrations from the client area. WHMCS Marketplace

How I'd rank them for your use case

*Add a migration tool if you want client-initiated one-click migrations rather than provider-assisted migrations.

Bottom line: If you want the hosting infrastructure to do as much of the work as possible, I'd start with 20i. If your agency wants maximum control, a familiar cPanel experience, and the ability to assemble a more sophisticated automation stack, I'd go cPanel/WHM + WHMCS + JetBackup + a migration add-on.

If you tell me roughly how many client sites you manage (e.g. 20, 50, 200) and whether they're mostly WordPress/cPanel, I can narrow this down to the 2–3 best reseller plans and compare actual 2026 pricing, limits, migrations, and backup/restore capabilities.

For a small agency managing client websites, I’d prioritize migration automation + reliable restores + low support overhead over the cheapest reseller plan. The “best” setup is usually not one tool, but a stack:

Best overall agency stack:

1. cPanel/WHM reseller hosting + WHMCS + JetBackup
   • WHMCS = client billing, provisioning, account creation, automation. It can automate the hosting customer lifecycle, including provisioning and account management. www.whmcs.com
   • JetBackup = the restore experience your clients actually care about: file/database/account restores from cPanel/WHM, including one-click full account recovery. www.jetbackup.com
   • cPanel/WHM = easiest ecosystem for agencies because most migration tools, developers, and clients already understand it.

My shortlist

If your agency mainly does WordPress sites

I would lean toward:

Option A (most professional):

• Reseller/VPS with cPanel + WHM
• JetBackup
• WHMCS
• CloudLinux
• LiteSpeed
• staging tool (Softaculous or similar)

This gives you:

• New client → automatic hosting account creation
• Existing client → migration workflow
• Client breaks something → self-service restore
• Monthly maintenance plans → recurring revenue

If you want the fewest moving parts

A provider like 20i is attractive because migration tooling and automation are more integrated into the platform. Their Migration Center supports moving websites, databases, and email accounts from common hosting platforms. www.20i.com

What I would avoid

• Cheap reseller accounts that only give you WHM/cPanel but no good backup system.
• “Unlimited websites” plans where you cannot isolate clients.
• Manual backup plugins as your only restore strategy (too many failure points).

For a small agency, my ranking would be:

1. 20i — easiest managed agency workflow
2. cPanel reseller + JetBackup + WHMCS — best long-term professional setup
3. InMotion / KnownHost-style cPanel resellers — good if you want more control

If you tell me your approximate client count (10, 50, 200+ sites), whether they are mostly WordPress, and whether you want to resell hosting as a product or just bundle hosting into maintenance plans, I can narrow it down.

For a small agency, I’d optimize for the stack rather than the reseller host alone:

My pick: cPanel/WHM + JetBackup 5 + WHMCS

That combination is probably the best fit if your priorities are automated client migrations, easy restores, and eventually automating provisioning/billing.

• JetBackup 5 is the key piece for migrations/restores. It supports cross-panel migrations between cPanel, Plesk and DirectAdmin, and can restore individual or multiple accounts. docs.jetbackup.comdocs.jetbackup.com
• It gives resellers/client accounts appropriately scoped access to backups, so you can let clients restore their own sites without handing them server-level control. docs.jetbackup.com
• WHMCS handles the business automation side—provisioning, account synchronization, suspensions, client portal, billing, etc. www.whmcs.com
• JetBackup can also do cross-platform account restores, which is particularly useful if you eventually move the agency to a different server/provider. docs.jetbackup.com

Which reseller host?

I'd shortlist InMotion, KnownHost, and Verpex, rather than choosing based purely on the cheapest reseller plan. Current 2026 comparisons particularly point to InMotion for an all-in-one agency setup and KnownHost for traditional cPanel/WHM value; Verpex is another strong white-label cPanel option. go.hostinglar.com

One important distinction: "one-click restore" and "automated migration" aren't necessarily features of the reseller host itself. I'd make JetBackup 5 a hard requirement. Its current restore system can restore files, databases, email, DNS, SSL, cron jobs and panel configuration, and it supports multi-account operations. docs.jetbackup.comdocs.jetbackup.com

For an agency starting small, I'd therefore build it as:

Your brand → reseller hosting → cPanel/WHM → JetBackup 5 → remote S3/B2 backup storage → WHMCS

That gives you a much more portable operation: if you outgrow the reseller account, you can move the clients to your own VPS/server without rebuilding the whole backup/migration workflow.

If you tell me roughly how many client sites you have (e.g. 10, 50, 100+) and whether they're mostly WordPress, I can narrow this down to the best 2–3 plans and approximate monthly cost.

If your agency’s priorities are automated migrations + one-click restores + client self-service, I’d choose 20i first, with a cPanel + JetBackup setup as the alternative if you want maximum compatibility.

My ranking

Why 20i stands out: its Migration Centre can automatically move files, databases and email from cPanel/WHM, DirectAdmin, Plesk and FTP/SFTP, and its reseller platform provides automated provisioning plus a documented API. www.20i.com It also offers HostShop, its own WHMCS alternative, with automated account management and built-in self-service migrations. www.20i.comwww.20i.com

The important distinction is restores. If “client clicks a button and gets yesterday's site back” is a core selling point, I'd favor a reseller host running JetBackup. JetBackup specifically supports customer-facing restore portals and one-click full cPanel account recovery, including files, databases, email, DNS and SSL. www.jetbackup.comwww.whmcs.com

What I'd do for a small agency

If you want the least operational work:
20i Reseller + HostShop. You get migration automation, provisioning, client management and API access without assembling a bunch of separate products. www.20i.comwww.20i.com

If you want the best long-term hosting stack:
cPanel/WHM + JetBackup + WHMCS (or Blesta). WHMCS handles automated provisioning, account synchronization and client self-service, while JetBackup handles the actual recovery workflow. www.jetbackup.comwww.whmcs.com

I'd lean toward the second setup if you're going to manage dozens/hundreds of client WordPress sites, because you're less locked into the reseller provider's proprietary control panel.

One caveat: “migration” and “restore” are different capabilities. A provider saying “free migrations” may mean their staff performs the migration for you—not that you or your client can initiate it with one click. For example, Hosting.com explicitly says its reseller migrations are handled by its migration team, rather than being a self-service tool. www.20i.comwww.20i.comhosting.com

If you tell me roughly how many client sites you have (e.g. 10, 50, 200) and whether they're mostly WordPress, I can narrow this down to the best 2–3 reseller platforms and actual monthly cost per client.

If your agency’s priorities are automated client migrations + one-click restores, I’d build around cPanel/WHM + JetBackup + WHMCS, rather than choosing a reseller host solely on its advertised “free migrations.”

My pick: cPanel reseller hosting + JetBackup

JetBackup is the strongest fit for your specific workflow. It supports:

• One-click full-account restores, including files, databases, email, DNS, SSL, cron jobs, etc. www.jetbackup.com
• Client self-service restores, so clients can recover files/databases/email without opening a ticket. www.jetbackup.comdocs.jetbackup.comdocs.jetbackup.comwww.whmcs.commarketplace.whmcs.com
• Reseller-level permissions, allowing your agency to manage backups for your own clients without giving you unrestricted server access. docs.jetbackup.com
• Cross-server/panel migrations, including cPanel-to-cPanel and supported cross-panel migrations. docs.jetbackup.com

Then put WHMCS on top for provisioning, billing, client accounts and automation. WHMCS can automatically create/suspend/modify hosting accounts and integrate directly with cPanel/WHM. www.whmcs.com

The workflow I'd use

New client → WHMCS → automatic account provisioning → migration wizard → JetBackup → ongoing automated backups → client self-service restore

For the migration front end, there are now WHMCS addons such as TivroMigrator that let a client initiate a migration themselves, including files, MySQL and email, with background jobs, retries and logging. marketplace.whmcs.com

So you could effectively offer:

“Give us your old hosting credentials → click Migrate → your site appears on our platform → backups run automatically → Restore is available whenever you need it.”

That's a much better agency proposition than simply saying you provide “reseller hosting.”

JetBackup vs Acronis

I'd choose JetBackup if you're primarily a cPanel reseller/small agency.

Acronis is very capable—it supports granular recovery of accounts, files, databases and mailboxes and has self-service recovery—but it's more compelling when you're operating a broader hosting infrastructure rather than simply running an agency reseller setup. www.acronis.com

Bottom line: If you're starting small, I'd prioritize a cPanel reseller provider that allows JetBackup/reseller-level backup access, then add WHMCS and a migration addon. That gives you the closest thing to a scalable, mostly hands-off client onboarding and recovery system.

If you tell me your approximate number of client sites (e.g. 20, 100, 500) and whether they're mostly WordPress/cPanel, I can narrow this down to the 3 best actual reseller hosts and compare their pricing, storage, migration automation, backups, and white-label options.

For a small agency, I’d pick 20i Reseller Hosting if your priorities are specifically automated migrations + client self-service restores + minimal admin work.

Why 20i fits your use case

20i's Migration Centre can automatically move sites, databases and email from cPanel/WHM, Plesk, DirectAdmin and FTP/SFTP sources. It explicitly supports self-managed migrations for your customers, which is unusually useful for an agency trying to eliminate migration tickets. www.20i.com

For restores, its Timeline Backups take daily snapshots and let you select a previous snapshot and restore the website/database. Customers can also get Backup/Restore functionality directly through StackCP. docs.20i.com

The important alternative: cPanel + JetBackup

If your agency specifically wants the traditional cPanel/WHM ecosystem, I'd instead build around a reseller/VPS setup that gives you JetBackup.

JetBackup for cPanel is arguably stronger than 20i for granular restores: it supports one-click full-account recovery and lets customers restore files, databases and email themselves from cPanel. www.jetbackup.com

For migrations, you can add a WHMCS migration module such as TivroMigrator, which gives clients a migration wizard and background/automatic migration jobs. marketplace.whmcs.com

My recommendation:

• Want the least operational headache: 20i
• Want maximum control and a conventional cPanel stack: cPanel/WHM + JetBackup + WHMCS
• Want clients to initiate their own migrations: 20i is particularly compelling
• Want sophisticated granular restore/backup controls: JetBackup wins

For a small agency, I'd lean 20i because you're buying an integrated workflow rather than assembling 3–4 separate products. Their current Reseller 25 starts at $19.99/mo after the introductory month, with larger plans at $39.99 and $69.99/mo, and includes white-label hosting, migrations, automation and API access. www.20i.com

20i Agency Hosting is also worth looking at if your goal is to manage hosting alongside your agency's client/site portfolio rather than operate a traditional hosting company.

For a small agency managing hosting for multiple clients, I’d choose a cPanel/WHM + JetBackup 5 + WHMCS stack rather than looking for a single “reseller hosting tool.”

My pick: cPanel + JetBackup 5 + WHMCS

Why this combination is particularly good for an agency:

• JetBackup 5 provides one-click full-account restores and granular restores of files, databases, email, DNS, SSL, cron jobs, etc. www.jetbackup.com
• It can also move accounts between supported panels, including cPanel, DirectAdmin, and Plesk, which is useful when you're consolidating clients onto your infrastructure. docs.jetbackup.com
• JetBackup has a customer-facing restore portal, so clients can recover files, databases, and email themselves rather than opening a ticket. www.jetbackup.com
• WHMCS handles automated provisioning, suspension, upgrades/downgrades, account syncing, billing, and the client portal. www.whmcs.com
• WHMCS can also synchronize existing accounts from cPanel, Plesk, or DirectAdmin, which makes onboarding an existing client base much easier. docs.whmcs.com

If you're starting from scratch

I'd structure it roughly like:

Your agency → WHMCS → cPanel/WHM → JetBackup 5 → remote S3/B2 storage

That gives you a fairly automated workflow:

New client → payment → hosting account automatically created → backups automatically run → client can self-restore → agency can migrate/restore entire accounts when needed.

The important distinction is that WHMCS is the business automation layer, while JetBackup is the migration/backup/restore layer. Trying to make one product do both tends to give you a less flexible setup.

For a small agency, I'd also keep backups off-server rather than relying solely on the hosting provider's local backups.

If you tell me roughly how many client sites you have (e.g. 20, 50, 200) and whether they're mostly WordPress/cPanel, I can recommend the best specific reseller host + plan + backup architecture and estimate the monthly cost.

For a small agency managing client websites, I’d pick 20i if your priority is automation, and ChemiCloud if your priority is cPanel + backups + familiar agency workflows.

My ranking

1. 20i — best overall for your use case

20i's Migration Centre can automatically move files, databases, and email from cPanel/WHM, Plesk, DirectAdmin, or FTP/SFTP, and it advertises unlimited free migrations. It also has automated provisioning, a reseller API, WHMCS integration, and self-service tools. www.20i.com

The big advantage for an agency is that you can build a workflow like:

New client → create hosting account → migrate site → provision package → client manages service

without your team manually touching every account.

The catch: 20i uses its own control-panel ecosystem rather than standard cPanel, so I'd choose it only if you're comfortable with that. Forbes also notes that moving away from 20i's custom control panel can be more difficult. www.forbes.com

2. ChemiCloud — my choice if you want cPanel

ChemiCloud is particularly attractive for a small agency because its reseller plans currently include WHM, cPanel accounts, free migrations, 30 daily backups, and WHMCS or Blesta on the higher tiers. chemicloud.com

That gives you the conventional stack:

WHM → individual cPanel accounts → WHMCS → automated provisioning → backups

It's a very sensible choice if your clients already come from cPanel hosts.

But there's an important distinction: if by "one-click restore" you mean the client logs into their own panel and restores their entire site/database/email without you, I'd specifically verify that your chosen host exposes JetBackup's end-user restore portal. JetBackup supports granular client self-service restores and full cPanel-account recovery. www.jetbackup.com

What I'd actually do

For a 5–50 client agency, I'd lean:

ChemiCloud + WHMCS + JetBackup

rather than chasing the cheapest reseller account.

That gives you a much more scalable operational model:

• Migration: automated/handled centrally
• Provisioning: WHMCS
• Backups: daily/automated
• Restore: client self-service where supported
• Hosting: separate cPanel account per client
• Branding: white-label/private nameservers
• Agency workload: substantially less repetitive support

If you want the most aggressive "client clicks a button and everything happens" automation, I'd choose 20i instead. Its Migration Centre is unusually strong for this particular requirement. www.20i.com

One other option worth considering is WHMCS + a migration add-on: there are now WHMCS modules such as TivroMigrator that let clients initiate migrations from their client portal themselves. marketplace.whmcs.com

Bottom line:
👉 ChemiCloud if you want a conventional cPanel agency platform.
👉 20i if automation/migration is the #1 consideration.
👉 Avoid choosing purely on storage/bandwidth—for an agency, migration, backup/restore, provisioning and support automation will save far more time.

For a small agency whose priorities are automated client migrations + easy restores, I’d pick 20i.

Why 20i fits your use case

• Automated migrations: its Migration Centre can move websites, databases, and email from cPanel/WHM, DirectAdmin, Plesk, or FTP/SFTP. You can migrate clients in batches, and 20i says the process is designed for no downtime/data loss. docs.20i.comwww.20i.com
• Easy restores: its StackCP control panel includes website/database backup and restore, while its timeline backups allow you to roll a site back to a previous date with a click. www.20i.com
• Client self-service: clients can get their own white-labeled control panel with backup/restore, 1-click apps, email, DNS, etc. www.20i.comwww.20i.com
• Agency automation: you get HostShop, WHMCS support, and an API, so you can automate provisioning and customer management rather than manually creating accounts. www.20i.comwww.20i.com
• White-label: clients don't have to know you're using 20i; branding and private nameservers are supported. docs.20i.comwww.20i.com

My shortlist

Verpex is a strong alternative if you specifically want traditional cPanel/WHM; its reseller plans include automatic backups and free migrations. verpex.com ChemiCloud is also compelling if WHMCS included with the hosting is important; its plans include WHMCS/Blesta, 30 daily backups, and free migrations. chemicloud.com

Bottom line: if you're trying to make hosting a low-touch recurring service for, say, 10–100 client sites, I'd start with 20i. Its migration + backup/restore workflow is unusually integrated, so you're not stitching together WHMCS, a migration tool, and a separate backup product.

If you tell me roughly how many client sites you have and whether they're mostly WordPress, I can narrow it down to the best plan/provider and estimate the monthly cost.

For a small agency managing client sites, I’d prioritize three things: automated migrations, reliable off-server backups with easy restores, and provisioning automation. On that basis, my pick would be 20i if you want the most automation, or InMotion Hosting + JetBackup if you want a more conventional cPanel/WHM setup.

My ranking

🥇 20i is particularly interesting for your use case. Its Migration Centre can automatically migrate files, databases and email from cPanel/WHM, DirectAdmin, Plesk and even FTP/SFTP. It also offers automated provisioning/management, WHMCS integration and a reseller API for building your own workflows. www.20i.com

🥈 InMotion Hosting is my choice if you specifically want the familiar cPanel/WHM + WHMCS ecosystem. Its reseller plans support WHMCS automation, while its Backup Manager can restore entire accounts or individual files/databases. The caveat is that its remote backup service is an additional service rather than simply assuming all reseller backups are included. www.inmotionhosting.com

🥉 Asura Hosting is worth considering if cost matters. It offers free migrations and integrates reseller accounts with WHMCS or Blesta for automated provisioning, suspension and termination. It also uses JetBackup for off-site backups. www.asurahosting.com

One important distinction

If by "one-click restores" you mean your clients themselves can roll a site back without opening a support ticket, I'd specifically look for JetBackup. It provides account-level restores and a customer-facing restore portal inside cPanel, including full account recovery. www.jetbackup.com

So my practical recommendation would be:

20i → best if migration/provisioning automation is the priority.
InMotion + JetBackup → best if backups/restores and conventional cPanel management are the priority.
Asura + JetBackup + WHMCS/Blesta → best budget-oriented stack.

If you tell me roughly how many client sites you manage (e.g. 10, 50, 200) and whether they're mostly WordPress, I can narrow this down to the best specific plan + monthly cost for an agency.

For a small agency managing client websites, I’d prioritize the backup/migration layer over the reseller host itself.

My pick: cPanel/WHM + JetBackup

JetBackup is particularly well suited to your use case because it supports one-click full-account restores, granular restores, and cross-server cPanel migrations. Clients can also get a restore portal rather than having to open a support ticket. www.jetbackup.com

Pair that with a reseller host that gives you:

• cPanel/WHM — makes migrations between hosts much easier.
• JetBackup or equivalent with off-site storage — don't rely solely on the host's backups.
• White-label/private nameservers — clients see your agency brand.
• WHMCS if you want automated provisioning, billing, suspensions, upgrades, etc. WHMCS can automate the customer lifecycle and synchronize cPanel accounts. www.whmcs.com
• Generous account limits so you don't have to migrate again as your client base grows.

The setup I'd use

Agency → reseller/VPS → cPanel/WHM → JetBackup → off-site backup storage

Then:

New client: migrate account → verify → switch DNS
Client breaks something: client/agency selects backup → restore → done
Client changes hosts: migrate the whole cPanel account

That's substantially more useful for an agency than choosing a reseller based purely on disk space or bandwidth.

Among current reseller providers, Verpex looks like a strong starting point if you want conventional white-label cPanel reseller hosting and migrations; current comparisons specifically highlight its cPanel/WHM, white-label capabilities and free migrations. go.hostinglar.com

If you tell me roughly how many client sites you have (e.g. 10, 50, 100+) and whether they're mostly WordPress, I can narrow it down to 2–3 specific reseller setups and compare the actual monthly cost.

For a small agency managing client websites, I’d pick 20i Reseller Hosting if your priority is minimizing hands-on work.

My pick: 20i

20i Reseller Hosting is unusually well-suited to the workflow you described:

• Automated migrations: its Migration Centre can automatically move files, databases, and email from cPanel/WHM, Plesk, DirectAdmin, FTP/SFTP, etc. www.20i.comwww.20i.com
• Unlimited free migrations rather than treating migrations as a paid support service. www.20i.comwww.20i.com
• Automated provisioning/management and WHMCS integration, so new client hosting can be provisioned without you manually creating accounts. www.20i.com
• White-label reseller hosting, private nameservers, and an API if you eventually want to integrate hosting into your agency's own systems. www.20i.com
• Its HostShop platform provides automatic provisioning and a client-facing management experience without requiring a separate WHMCS license. www.20i.com

But there's an important distinction

If one-click client restores are your #1 requirement, I'd favor a cPanel + JetBackup setup.

JetBackup specifically provides client self-service restores, including files, databases and email, plus full-account recovery. www.jetbackup.com

And WHMCS is the better choice for the business automation layer—provisioning, suspension, billing, account synchronization, client portal, etc. www.whmcs.com

So I'd think about it as:

For a small agency, I'd start with 20i unless you specifically want clients to be able to log in and restore individual files/databases themselves. If that's a selling point of your hosting service, I'd instead choose a reseller host that explicitly includes JetBackup at the reseller level, then layer WHMCS on top.

If you tell me roughly how many client sites you host now (e.g. 10, 50, 100+) and whether they're mostly WordPress, I can narrow this down to the 3 best reseller platforms for your exact setup and compare price, migrations, backups/restores, WHMCS, and white-labeling.

For a small agency managing client sites, I’d pick 20i Reseller Hosting.

It’s unusually well matched to your two priorities:

• Automated migrations: 20i’s Migration Centre can move sites, databases, and email from cPanel/WHM, Plesk, DirectAdmin, or FTP/SFTP. It supports bulk migrations and is designed to run without downtime. docs.20i.com
• Client self-service migrations: you can expose the Migration Centre through StackCP, so clients can migrate themselves rather than opening a ticket with your agency. www.20i.com
• One-click restores: its Timeline Backups provide daily snapshots, with the ability to restore a site/database from a selected point in time. docs.20i.com
• Agency automation: HostShop handles provisioning, modification, suspension and termination automatically, while 20i also supports WHMCS and has a reseller API. www.20i.comwww.20i.com
• White label: client-facing control panels, documentation and branding can be presented under your agency rather than 20i. www.20i.comwww.20i.com
• Pricing is reasonable for a small agency: the current US reseller plans start around $19.99/mo after the introductory period for 25 accounts, with larger 50- and 500-account tiers available. www.20i.comwww.20i.com

My ranking for your use case

The main alternative I'd consider is KnownHost Reseller Hosting if you specifically want the cPanel/WHM ecosystem. KnownHost offers reseller hosting designed around WHMCS, while JetBackup provides granular backups and one-click full-account restores. www.knownhost.com

So my recommendation is: 20i if your priority is minimizing agency support work; KnownHost + JetBackup if your priority is having a more traditional cPanel-based hosting stack.

For a small agency, I'd lean 20i because the migration workflow is actually something you can hand to clients, rather than something your team has to perform for every new site.