this post was submitted on 08 Feb 2025
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What do people use for a shelf-stable backup (lemmy.nz)
submitted 1 year ago by Dave@lemmy.nz to c/selfhosted@lemmy.world
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I have backups on a backup hard drive and also synced to B2, but I am thinking about backing up to some format to put in the cupboard.

The issue I see is that if I don't have a catastrophic failure and instead just accidentally delete some files one day while organising and don't realise, at some point the oldest backup state is removed and the files are gone.

The other thing is if I get hit by a bus and no one can work out how to decrypt a backup or whatever.

So I'm thinking of a plain old unencrypted copy of photos etc that anyone could find and use. Bonus points if I can just do a new CD or whatever each year with additions.

I have about 700GB of photos and videos which is the main content I'm concerned about. Do people use DVDs for this or is there something bigger? I am adding 60GB or more each year, would be nice to do one annual addition or something like that.

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[โ€“] Krik@lemmy.dbzer0.com 2 points 1 year ago (1 children)

Btrfs and zfs are self-healing.

You can make a script to check for errors and autocorrection yourself but that needs at least a second hdd. On both drives are the same data and a file or database with the checksums of the data. The script then compares the actual checksums of the two copies and the db checksum. If they match -> perfect. If they don't match the file where there are two matching checksum is the good one and replaces the faulty one or corrects the db entry, whichever is defect. That's it. It doesn't have to be more complicated.

[โ€“] Dave@lemmy.nz 2 points 1 year ago

Yip I think this is the setup I will want (probably both - zfs + a custom script for validation, just to be sure). Two mirrored drives. I do need to read up some about zfs mirroring to understand it a bit more but I think I have a path to follow now.