NeoNachtwaechter , 1 month ago

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 :-)