Back up to any drive, NAS or cloud. Then see every folder's real size, find any file in any version, and clear junk out of old backups.
See where the space goes. Every folder you back up, with the space it really takes after deduplication and how much you'd get back by deleting its snapshots.
How it works
Back up to a drive, NAS or the cloud on a schedule, encrypted and deduplicated by Kopia.
See what every folder really costs, every version of every file, and what grows each night.
Remove junk from every old backup that holds it, and keep the rest of your history.
See inside
Browse snapshots the way you do in KopiaUI, plus the ways you wish you could.
Every folder you back up, with the space it really takes after deduplication and how much you'd get back by deleting its snapshots.
Also in KopiaLens: Tasks, Repository, Logs, Backblaze. See every feature
Backups
KopiaLens runs your backups on a schedule, keeps every version, and gets files back when you need them.
Each folder backs up on its own schedule. Failed backups retry, and you can pause or back up by hand.
Find a file by name across every snapshot, including files you've deleted, and restore it next to the original.
Check that every snapshot can be read, and download a share of files to test their contents.
Hear about a failed backup in the app, the tray, or on your phone through ntfy or a webhook.
Kopia encrypts everything on your computer before it leaves, compresses it, and stores repeated data once, even across computers.
A local or network drive, SFTP, S3 and S3-compatible storage, Backblaze B2, Azure, Google Cloud, Google Drive, WebDAV, or anything rclone reaches.
Underneath is Kopia, the open-source backup engine trusted by thousands.
Start backing up from scratchClean up
That's what makes it reliable. It also means a cache folder or a 40 GB disk image that slipped in once stays in every snapshot that holds it. KopiaLens finds it and removes it from all of them.
KopiaUI shows each snapshot's size before deduplication, so it can't tell you which folders really hold the space. KopiaLens shows the real size of every folder.
A 50 MB database that changes every night can take 10 GB in old versions. Churn finds files like it, and Prune keeps only the versions you want.
Removing a file from existing snapshots used to mean kopia's command line and a guess at what it frees. KopiaLens shows the space first, then does it for you.
Removing data from a backup should never be a leap of faith.
The files that will go, the snapshots they're in, and the space they free.
kopia's own dry run shows its answer before anything changes.
A confirm dialog that names exactly what goes and what can't be undone.
A job with live progress and a log, removing exactly what you previewed.
ProRemoving data from inside snapshots is Pro. Every preview is free, so you see what you'd get back first.See what Pro includes
Indexing only reads your repository. Nothing in it changes until you start an action and confirm it.
File names and sizes stay on your own disk, encrypted by default.
Your backups stay ordinary Kopia backups. KopiaUI and the kopia command line can always open them.
Activate once, and Pro keeps working even when you're offline.
Already use Kopia?
KopiaLens opens the repository you already have. Nothing is copied or converted.
Everything KopiaUI does, in one app, plus the views it doesn't have.
Move from KopiaUIOpens the same repository. Nothing to migrate, and KopiaUI keeps working.
KopiaLens alongside KopiaUIUsing BlinkDisk? KopiaLens opens BlinkDisk vaults too. Using KopiaLens with BlinkDisk
AI agents
An AI agent in your terminal can use klens, KopiaLens's command line, to answer questions about your backups and prepare cleanups.
Read-only to look and plan, or full access to act. Revoke one without touching the others.
Anything that removes data waits for your approval in KopiaLens. An agent can't approve its own request.
The audit log lets you verify every action an agent takes.
Ask it things like
Platforms
Runs where your backups run.
A desktop app with a tray icon that starts with your computer. Kopia comes bundled.
First-time setupOne Docker container with kopia built in, for a home server or NAS. Open it from any browser on your network.
Running in DockerInstall it as a Home Assistant add-on and keep an eye on your backups next to the rest of your home.
Home Assistant add-onSign-in, HTTPS and reverse-proxy support let you reach KopiaLens safely from other devices.
Remote access and HTTPSPricing
Backups, restore, search and every analysis view are free, with no time limit and no account. Pro removes junk from inside your old backups.
$0forever
The whole backup app. No time limit, no account.
$20Regular price $30per year
Locked in for every renewal
Get your space back from inside old backups, for a year.
$50Regular price $80one time
Pay once and keep Pro.
$99Regular price $150per year
Locked in for every renewal
For companies using Pro on work data.
Supporting on Patreon? Every paid Patreon tier includes Pro for as long as you're a member. Sign in with Patreon in KopiaLens to turn it on. See the Patreon page
On paid cloud storage, Pro can pay for itself. Work out what your junk costs
Compare
KopiaLens can replace KopiaUI, run alongside it, or be your first Kopia app. Here's what each one does.
Run backups on a schedule
Browse, restore and mount snapshots
Edit policies, retention and exclusions
Physical size of each folder after deduplication
Space freed by deleting a snapshot
Search files across every snapshot and repository
Churn: what changes every night
Simulate a retention policy
Delete snapshots
Remove files from existing snapshots
Preview the space a removal frees
Price
Why KopiaLens exists
I built KopiaLens because I needed a way to find out why my backups were taking so much more space than they should have. With this tool, I've been able to reclaim 400+ GB across 5 TB of Kopia repos, just by deleting useless junk that kept backing up. I hope it helps other users do the same, and more.
Anshul
Creator of KopiaLens
FAQ
Indexing only reads your repository. Nothing in it changes until you start an action and confirm it. Every removal shows the files it will remove and the space it frees, lets you run kopia's dry run first, and then removes exactly what you previewed. Every action is logged, so you can always trace what changed and when.
No, it's up to you. KopiaLens does everything KopiaUI does, so it can replace it. It can also run next to KopiaUI on the same repository, with nothing to migrate. And if you've never used Kopia, it's a complete backup app on its own.
KopiaLens alongside KopiaUINo. First-time setup creates a repository (the storage where your backups live) on a drive, NAS or cloud storage, and then you pick the folders to back up and when. The glossary explains any Kopia word you come across.
New to backups? Start herePro clears junk out of your old backups. It removes files and folders from existing snapshots, prunes versions you don't need, and adds rules that exclude similar files in one go. Everything else is free: backups, restore, search, every analysis view, and the preview of what a Pro action would free.
Compare Free and ProWherever you choose. Kopia keeps your backups in a repository on a local or network drive, SFTP, Amazon S3 or another S3-compatible service, Backblaze B2, Azure, Google Cloud Storage, Google Drive, WebDAV, or anything rclone reaches. Everything is encrypted on your computer before it's stored.
Already have a repository? KopiaLens runs kopia itself, so it opens the repositories kopia opens.
KopiaLens is used every day on two real repositories with very different shapes: a whole-PC backup of about 1 TB with around 20 million file versions and 7,500 snapshots, and a 4 TB media repository of fewer, much larger files. The first index of a big repository takes a while, and KopiaLens shows an estimate as it goes; after that, a nightly pass keeps it current.
Got a much bigger repository, or running into trouble? Email support@kopialens.com and we'll look at it with you.
KopiaLens comes with the kopia version it's tested with, and newer kopia versions arrive in KopiaLens updates once they've been tested. If you'd rather use your own kopia, you can point KopiaLens at it in Settings.
Once a day it checks for updates and sends a few anonymous usage stats, such as the version and which features were used. Nothing from your backups is ever sent: no paths, file names, sizes or repository addresses. Both can be turned off in Settings, which shows exactly what the next check sends. With Pro, KopiaLens also checks your licence once a week when you're online.
What the update check sendsWindows, macOS and Linux as a desktop app, Docker for home servers and NAS boxes, and Home Assistant as an add-on. Wherever it runs, you can open it from any browser on your network.
The free version has no time limit, and every preview is free, so you can see what a Pro action would free before you buy. The demo data built into KopiaLens unlocks every Pro action to try.
Your backups are standard Kopia backups, so KopiaUI and the kopia command line can always open, restore and keep running them, with or without KopiaLens. Pro also works offline, so the copy you have keeps working. And if I ever stop developing KopiaLens, I'll publish its full source code so the community can keep it going.
Something else? Read the docs or email support@kopialens.com.
Download KopiaLens free. It opens the Kopia backups you already have, or starts new ones.
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KopiaLens is built by one independent developer. Back its development on Patreon, GitHub Sponsors, Ko-fi or PayPal.