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Cloud · head to head

Kustomize vs UrBackup

Kustomize logo

Kustomize

Cloud

Template-free customisation of Kubernetes YAML

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: Kustomize no packaging or distribution story, which is exactly what Helm charts provide; 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: Kustomize covers Overlay patching, UrBackup covers Windows image backups.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Kustomize and UrBackup actually diverge.

Attributes where Kustomize and UrBackup differ
AttributeKustomizeUrBackup
PlatformsKubernetes, Linux, macOS, WindowsLinux, 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 Kustomize

  • Overlay patching
  • No templating language
  • Built into kubectl
  • Generators

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.

Kustomize

  • Managing dev, staging and production variants of the same manifestsnot UrBackup
  • Keeping manifests readable and directly applyable rather than templatednot UrBackup
  • Patching third-party manifests without forking themnot UrBackup

UrBackup

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

Where each one falls short

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

Kustomize

  • No packaging or distribution story, which is exactly what Helm charts provide
  • Deeply nested overlays become hard to follow, and reasoning about the final output requires building it
  • No release lifecycle: nothing tracks what is installed or supports rollback the way Helm does
  • Patch syntax is fiddly for anything beyond simple field replacement

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

Kustomize

Free
  • KustomizeFree
    • 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 Kustomize if

  • You need overlay patching.
  • You want to start without paying.
  • You work on Kubernetes, Linux, macOS, Windows.
  • You also want no templating language.
Kustomize 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 Kustomize or UrBackup better?
Neither clearly leads. Kustomize 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, Kustomize or UrBackup?
Kustomize starts at Free and UrBackup at Free.
Does Kustomize or UrBackup run on more platforms?
Kustomize runs on Kubernetes, Linux, macOS, Windows. UrBackup runs on Linux, Windows, macOS, FreeBSD.
Can I use Kustomize for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kustomize best used for?
Kustomize is most often used for managing dev, staging and production variants of the same manifests, keeping manifests readable and directly applyable rather than templated, patching third-party manifests without forking them. Of those, managing dev, staging and production variants of the same manifests and keeping manifests readable and directly applyable rather than templated are not what UrBackup is typically brought in for.
What can Kustomize do that UrBackup cannot?
Kustomize covers Overlay patching, No templating language, Built into kubectl, Generators. UrBackup covers Windows image backups, File backups, Web interface, Client discovery.

Answered from the vendors’ own pages

Kustomize: Is Kustomize free?

Yes, open source and part of the Kubernetes project.

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.

Kustomize: Kustomize or Helm?

Kustomize patches plain YAML and keeps bases readable; Helm templates and packages applications with a release lifecycle. Many teams use both — Helm to install third-party charts, Kustomize to patch them.

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.

Kustomize: Do I need to install Kustomize?

No. It is built into kubectl, available through kubectl apply -k.

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.

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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