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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Deduplication tool (lemmy.world)

submitted 4 months ago* (last edited 4 months ago) by Agility0971@lemmy.world to c/linux@lemmy.ml

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I'm in the process of starting a proper backup solution however over the years I've had a few copy-paste home directory from different systems as a quick and dirty solution. Now I have to pay my technical debt and remove the duplicates. I'm looking for a deduplication tool.

accept a destination directory
source locations should be deleted after the operation
if files content is the same then delete the redundant copy
if files content is different, move and change the name to avoid name collision I tried doing it in nautilus but it does not look at the files content, only the file name. Eg if two photos have the same content but different name then it will also create a redundant copy.

Edit: Some comments suggested using btrfs' feature duperemove. This will replace the same file content with points to the same location. This is not what I intend, I intend to remove the redundant files completely.

Edit 2: Another quite cool solution is to use hardlinks. It will replace all occurances of the same data with a hardlink. Then the redundant directories can be traversed and whatever is a link can be deleted. The remaining files will be unique. I'm not going for this myself as I don't trust my self to write a bug free implementation.

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[–] biribiri11@lemmy.ml 3 points 4 months ago* (last edited 4 months ago)

Tbf you did start your post with

I’m in the process of starting a proper backup

So you’re going to end up with at least a few people talking about how to onboard your existing backups into a proper backup solution (like borg). Your bullet points can certainly probably be organized into a shell script with sync, but why? A proper backup solution with a full backup history is going to be way more useful than dumping all your files into a directory and renaming in case something clobbers. I don’t see the point in doing anything other than tarring your old backups and using borg import-tar (docs). It feels like you’re trying to go from one half-baked, odd backup solution to another, instead of just going with a full, complete solution.