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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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backups for SD card disk image? that don't take up tonnes of space and can be rolled back? (lemmy.world)

submitted 3 months ago by RedSquadCampFollower@lemmy.world to c/linux@lemmy.ml

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I would like to make manual backups of an SD card as a disk image so that it can be easily recreated when needed. I'd like to keep a few versions in case there is a problem I didn't know about, it can be rolled back.

How can I do this incrementally, or with de-duplication, so that I don't have to keep full copies of the complete SD card? It's very big but most of the content won't be changing much.

It's for MiyooCFW ROM which is on FAT 32-formatted micro SD card.

Thanks for your help! Also let me know if I am going about the problem in a wrong way.

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[–] NeoNachtwaechter@lemmy.world 1 points 3 months ago (2 children)

I haven't tried such a thing, but I remember ZFS has an option for block deduplication.

So you would set up a ZFS with block deduplication (and probably without compression - try this point out), and then you make your backup images with the dd tool and the correct block size.

Now you make always full copies and have them as normal files but they take only the disk space of the differences.

let me know if I am going about the problem in a wrong way.

I would not say "wrong way". I's fun to think about such things and try them out.

On the other hand I think a FAT32 can have only 32Gb. I would not mind having many of them lying around on my home NAS that has 12 Tb on RAID :-)

[–] RedSquadCampFollower@lemmy.world 1 points 3 months ago (1 children)

hmmm I think this is a bit beyond me; at this point I don't want to create an additional side project. I might learn about the more modern spiffy file systems in a few years.

[–] NeoNachtwaechter@lemmy.world 2 points 3 months ago

in a few years.

Never give up :-)