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Backup · head to head

Proxmox Backup Server vs Windows Backup

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
Windows Backup logo

Windows Backup

Backup

Built-in backup and recovery for Windows

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; Windows Backup folder backup goes to OneDrive, and a free Microsoft account comes with only 5 GB of OneDrive storage
  • They diverge on capability: Proxmox Backup Server covers Deduplicated chunk store, Windows Backup covers File History.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

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

Attributes where Proxmox Backup Server and Windows Backup differ
AttributeProxmox Backup ServerWindows Backup
Pricing modelOpen source, no licence feefree
PlatformsLinuxWindows
FoundedUnknown1975

Identical on both: starting price (Free), free tier (Yes), 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 Proxmox Backup Server

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

Only in Windows Backup

  • File History
  • System image backup
  • OneDrive integration
  • System restore points
  • Reset this PC
  • Recovery drive
  • OneDrive
  • Windows Server

What people use each for

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

Proxmox Backup Server

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

Windows Backup

  • Moving folders, settings and app list to a new Windows PCnot Proxmox Backup Server
  • Basic personal file backup for a Windows home usernot Proxmox Backup Server

Where each one falls short

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

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.

Windows Backup

  • Folder backup goes to OneDrive, and a free Microsoft account comes with only 5 GB of OneDrive storage
  • It requires signing in with a Microsoft account rather than a local Windows account
  • Personalization preferences are not backed up if OneDrive storage is insufficient
  • OneDrive folder syncing through Windows Backup is not available for work or school accounts, and Windows does not remember apps for those accounts
  • Device settings sync for a work or school account only if the organization allows it

Pricing, plan by plan

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

Windows Backup

Free
  • Built-inFree
    • File History
    • System image
    • OneDrive sync

Which should you pick?

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

Choose Windows Backup if

  • You need file history.
  • You want to start without paying.
  • You work on Windows.
  • You also want system image backup.
Windows Backup review

Questions people ask

Is Proxmox Backup Server or Windows Backup better?
Neither clearly leads. Proxmox Backup Server starts at Free and Windows Backup at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Proxmox Backup Server or Windows Backup?
Proxmox Backup Server starts at Free and Windows Backup at Free.
Does Proxmox Backup Server or Windows Backup run on more platforms?
Proxmox Backup Server runs on Linux. Windows Backup runs on Windows.
Can I use Proxmox Backup Server for free?
Both have a free tier, so you can try either at no cost before committing.
What is Proxmox Backup Server best used for?
Proxmox Backup Server is most often used for backing up a proxmox ve cluster with incremental block level backups of running guests, replacing a backup product whose licence is priced per socket or per terabyte on a virtualisation estate, proving backup integrity on a schedule rather than discovering corruption during a restore, keeping an encrypted second copy on a remote server or on tape without a third party service. Of those, backing up a proxmox ve cluster with incremental block level backups of running guests and replacing a backup product whose licence is priced per socket or per terabyte on a virtualisation estate are not what Windows Backup is typically brought in for.
What can Proxmox Backup Server do that Windows Backup cannot?
Proxmox Backup Server covers Deduplicated chunk store, Incremental guest backups, Client side encryption, Verification jobs. Windows Backup covers File History, System image backup, OneDrive integration, System restore points.

Answered from the vendors’ own pages

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.

Windows Backup: How much cloud storage do I get with Windows Backup?

Your Microsoft account includes 5 GB of free OneDrive cloud storage. "More storage is available to purchase if you need it" for users requiring additional capacity.

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.

Windows Backup: What types of Microsoft accounts are supported by Windows Backup?

Windows Backup works exclusively with personal Microsoft accounts (such as those ending in @outlook.com or @live.com). The service explicitly does not support work or school accounts at this time.

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.

Windows Backup: Can I restore my backup to a different PC?

Yes. When setting up a new device, simply sign in with the same Microsoft account used to create the original backup. "If you have more than one PC backed up, you can select More options and select the backup you wish to restore from."

Source
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.

Windows Backup: How do I delete my backed-up data if I no longer want it stored?

Visit your Microsoft Account Devices page, locate the Cloud synced settings section at the bottom, and select 'Clear stored settings' to delete previously backed-up data from your account.

Source
Windows Backup: Which folders and settings can I choose to back up?

You can selectively back up Desktop, Documents, Pictures, Videos, and Music folders, plus settings including apps, accessibility, accounts, Wi-Fi passwords, personalization, and language preferences.

Source
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