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Cloud · head to head

K3s vs UrBackup

K3s logo

K3s

Cloud

Lightweight certified Kubernetes distribution in a single binary

From
Free
Rated
-
Full reviewWebsite
UrBackup logo

UrBackup

Backup

Open source client server backup doing both file and whole disk image backups of Windows machines

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: K3s the SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity; UrBackup backups are stored on the server without encryption at rest by default, so the backup server holds a readable copy of every machine it protects and becomes the highest value target on the network.
  • They diverge on capability: K3s covers Single binary, UrBackup covers Windows image backups.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which K3s and UrBackup actually diverge.

Attributes where K3s and UrBackup differ
AttributeK3sUrBackup
PlatformsLinux, ARM, Self-hostedLinux, Windows, macOS, FreeBSD
CategoryCloudBackup

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).

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 K3s

  • Single binary
  • SQLite by default
  • Certified conformant
  • Batteries included
  • Low resource footprint
  • Simple install

Only in UrBackup

  • Windows image backups
  • File backups
  • Web interface
  • Client discovery
  • Internet mode
  • Filesystem deduplication

What people use each for

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

K3s

  • Kubernetes on edge sites and IoT hardware where full clusters will not fitnot UrBackup
  • Development and CI clusters that must start fast and cost nothingnot UrBackup
  • Small production clusters where full Kubernetes is more operations than the workload justifiesnot UrBackup
  • Teaching and learning Kubernetes without cloud spendnot UrBackup

UrBackup

  • A small office with Windows workstations that needs bare metal restore without per seat licensingnot K3s
  • Schools and labs where machines are re-imaged often and a known good image must be recoverablenot K3s
  • Backing up a mixed fleet to one server on premises with a web interface non specialists can usenot K3s
  • Replacing an expiring commercial endpoint backup licence where the budget is the constraintnot K3s

Where each one falls short

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

K3s

  • The SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity
  • Bundled components such as Traefik are opinionated defaults that larger teams often strip out and replace
  • Removed in-tree cloud provider integrations mean cloud-specific features need external controllers
  • Aimed at small and edge clusters, so very large deployments are better served by a standard distribution

UrBackup

  • Backups are stored on the server without encryption at rest by default, so the backup server holds a readable copy of every machine it protects and becomes the highest value target on the network.
  • Deduplication relies on filesystem features such as hard links, btrfs or ZFS, so a server built on the wrong filesystem silently consumes far more space and the fix is a rebuild rather than a setting.
  • There is no native object storage target, so offsite copies mean replicating the server storage with another tool rather than backing up to a bucket directly.
  • Restoring a full Windows image requires booting a restore environment, which is a manual, on site procedure that needs to be rehearsed before the day it is needed.
  • A single server holds everything and there is no built in clustering, so its own failure removes every recovery point at once unless you have separately solved replication.

Pricing, plan by plan

K3s

Free
  • K3sFree
    • Full functionality
    • No usage limits
    • Community support

UrBackup

Free
  • UrBackupFree
    • Full functionality, unlimited clients
    • File and image backups
    • Web administration interface

Which should you pick?

Choose K3s if

  • You need single binary.
  • You want to start without paying.
  • You work on Linux, ARM, Self-hosted.
  • You also want sqlite by default.
K3s review

Choose UrBackup if

  • You need windows image backups.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, FreeBSD.
  • You also want file backups.
UrBackup review

Questions people ask

Is K3s or UrBackup better?
Neither clearly leads. K3s starts at Free and UrBackup at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, K3s or UrBackup?
K3s starts at Free and UrBackup at Free.
Does K3s or UrBackup run on more platforms?
K3s runs on Linux, ARM, Self-hosted. UrBackup runs on Linux, Windows, macOS, FreeBSD.
Can I use K3s for free?
Both have a free tier, so you can try either at no cost before committing.
What is K3s best used for?
K3s is most often used for kubernetes on edge sites and iot hardware where full clusters will not fit, development and ci clusters that must start fast and cost nothing, small production clusters where full kubernetes is more operations than the workload justifies, teaching and learning kubernetes without cloud spend. Of those, kubernetes on edge sites and iot hardware where full clusters will not fit and development and ci clusters that must start fast and cost nothing are not what UrBackup is typically brought in for.
What can K3s do that UrBackup cannot?
K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. UrBackup covers Windows image backups, File backups, Web interface, Client discovery.

Answered from the vendors’ own pages

K3s: Is K3s free?

Yes. K3s is open source with no licence fee. SUSE sells commercial support around Rancher separately.

UrBackup: Does it back up Linux servers as well?

File backups yes, image backups no. The image path is Windows only through volume shadow copy.

K3s: Is K3s real Kubernetes?

Yes. It is CNCF-certified conformant, so standard manifests, kubectl and Helm charts work without modification.

UrBackup: Is the data encrypted?

Transport can be encrypted, and there is optional client side file encryption, but the default server storage is not encrypted at rest. Use full disk encryption on the server.

K3s: Why is K3s smaller than Kubernetes?

It strips legacy, alpha and in-tree cloud provider code, packages everything as one binary, and defaults to SQLite instead of etcd.

UrBackup: Can I back up to Amazon S3?

Not directly. The server writes to local or mounted storage, so cloud copies are made by replicating that storage separately.

K3s: Can K3s run in production?

Yes, and it does, particularly at the edge and for small clusters. For a highly available control plane you need to move off the SQLite default to etcd or an external datastore.

UrBackup: How many clients can one server handle?

Dozens is routine on decent hardware. The limit is usually storage input and output during overlapping backup windows rather than client count.

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