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Backup · head to head

Keepit vs Proxmox Backup Server

Keepit logo

Keepit

Backup

Independent cloud backup for SaaS workloads

From
$3/month
Rated
-
Full reviewWebsite
Proxmox Backup Server logo

Proxmox Backup Server

Backup

Deduplicating backup server for virtual machines, containers and Linux hosts, with verification built in

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Proxmox Backup Server has a free tier, so it costs nothing to try first.
  • Each has a real cost: Keepit search functionality is very limited with restrictive search strings and poor filter options; Proxmox Backup Server there is no Windows client, so physical Windows machines must be backed up by something else and the estate ends up with two backup products.
  • They diverge on capability: Keepit covers Vendor-independent storage, Proxmox Backup Server covers Deduplicated chunk store.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Keepit and Proxmox Backup Server actually diverge.

Attributes where Keepit and Proxmox Backup Server differ
AttributeKeepitProxmox Backup Server
Starting price$3/monthFree
Pricing modelsubscriptionOpen source, no licence fee
Free tierNoYes
PlatformsWebLinux
Founded2017Unknown

Identical on both: user rating (Not yet rated), category (Backup).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Keepit

  • Vendor-independent storage
  • Immutable backup
  • Blockchain verification
  • Unlimited retention
  • Granular restore
  • API access
  • Microsoft 365
  • Google Workspace

Only in Proxmox Backup Server

  • Deduplicated chunk store
  • Incremental guest backups
  • Client side encryption
  • Verification jobs
  • Remote sync
  • Live restore and file level restore

What people use each for

The jobs each tool is most often brought in to do.

Keepit

  • Data protectionnot Proxmox Backup Server
  • Disaster recoverynot Proxmox Backup Server
  • Business continuitynot Proxmox Backup Server
  • Ransomware protectionnot Proxmox Backup Server
  • Compliancenot Proxmox Backup Server

Proxmox Backup Server

  • Backing up a Proxmox VE cluster with incremental block level backups of running guestsnot Keepit
  • Replacing a backup product whose licence is priced per socket or per terabyte on a virtualisation estatenot Keepit
  • Proving backup integrity on a schedule rather than discovering corruption during a restorenot Keepit
  • Keeping an encrypted second copy on a remote server or on tape without a third party servicenot Keepit

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Keepit

  • Search functionality is very limited with restrictive search strings and poor filter options
  • Download speeds during restoration are slow, particularly for mailbox restorations
  • Console interface is complex and unintuitive, making file retrieval time-consuming
  • Limited support for advanced features like Power Automate flows and manual backup job initiation
  • Primarily targets SaaS applications and is not a single platform for on-premises workloads, VMs, or endpoint backup

Proxmox Backup Server

  • There is no Windows client, so physical Windows machines must be backed up by something else and the estate ends up with two backup products.
  • The datastore is millions of small chunk files, so it needs storage with real input and output capability and performs poorly on a single spinning disk or an SMB or NFS share.
  • Deduplication is per datastore, so splitting workloads across datastores for retention or tenancy reasons multiplies the storage those workloads consume.
  • Garbage collection depends on file access time semantics on the underlying filesystem, so a datastore mounted with the wrong options can fail to reclaim space or, worse, behave unpredictably.
  • Subscriptions are priced per CPU socket per year, so a backup server consolidated onto fewer larger dual socket machines pays twice per host for the supported repository.

Pricing, plan by plan

Keepit

$3/month
  • Keepit Business$3/month
    • Immutable backup
    • Unlimited retention
    • Blockchain verification

Proxmox Backup Server

Free
  • No subscriptionFree
    • Full functionality with no capacity limit
    • Community package repository
    • Community forum support
  • Subscription$undefined/year
    • Priced per CPU socket per year
    • Access to the enterprise package repository
    • Vendor support tickets

Which should you pick?

Choose Keepit if

  • You need vendor-independent storage.
  • You also want immutable backup.
Keepit review

Choose Proxmox Backup Server if

  • You need deduplicated chunk store.
  • You want to start without paying.
  • You work on Linux.
  • You also want incremental guest backups.
Proxmox Backup Server review

Questions people ask

Is Keepit or Proxmox Backup Server better?
Neither clearly leads. Keepit starts at $3/month and Proxmox Backup Server at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keepit or Proxmox Backup Server?
Proxmox Backup Server has a free tier; the other does not. Paid plans start at $3/month for Keepit and Free for Proxmox Backup Server.
Does Keepit or Proxmox Backup Server run on more platforms?
Keepit runs on Web. Proxmox Backup Server runs on Linux.
Can I use Proxmox Backup Server for free?
Yes. Proxmox Backup Server has a free tier, so you can try it without paying. Keepit starts at $3/month.
What is Keepit best used for?
Keepit is most often used for data protection, disaster recovery, business continuity, ransomware protection. Of those, data protection and disaster recovery are not what Proxmox Backup Server is typically brought in for.
What can Keepit do that Proxmox Backup Server cannot?
Keepit covers Vendor-independent storage, Immutable backup, Blockchain verification, Unlimited retention. Proxmox Backup Server covers Deduplicated chunk store, Incremental guest backups, Client side encryption, Verification jobs.

Answered from the vendors’ own pages

Keepit: What SaaS applications does Keepit protect?

Keepit provides backup for Microsoft 365 workloads (Teams, Exchange, OneDrive, SharePoint, Groups, Public Folders), Microsoft Entra ID, Google, Salesforce, and 15 SaaS applications total as of 2026, with plans to add more.

Source
Proxmox Backup Server: Can it back up machines that are not on Proxmox?

Linux hosts yes, through the client, at file level. Other hypervisors and physical Windows machines are outside its scope.

Keepit: How is Keepit priced?

Keepit uses custom pricing starting at $5 per seat monthly. Enterprise plans are custom quoted, with median annual contracts around $60,270. The pricing includes unlimited data storage.

Source
Proxmox Backup Server: Is a subscription required?

No. Without one you use the community repository and forum support. The subscription buys the tested enterprise repository and vendor tickets.

Keepit: Does Keepit guarantee immutability?

Yes, Keepit's architecture runs on secure, private infrastructure offering data immutability to prevent ransomware and accidental deletion.

Source
Proxmox Backup Server: How do I know a backup will restore?

Run verification jobs. They re-read the stored chunks and mark snapshots verified or failed, which is stronger evidence than a successful backup log.

Proxmox Backup Server: What storage should the datastore be on?

Local disks, ideally with ZFS and enough input and output capacity for many small files. Network shares are supported but routinely disappointing.

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