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Immutable backup for important data
(sh.itjust.works)
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this post was submitted on 31 Jul 2024
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I use backblaze storage with Kopia, which supports using object lock. Every time a backup is made the objects for it are locked for a configurable amount of time. I use 30 days, so an attacker would have to compromise my backup software for a month before being able to erase my backups.
I like the thought of having timed backups to keep the costs lower by pruning the olds backups.
Also only differences are stored, so if your files don’t change much each backup costs very little. I keep hundreds of backups for the previous year of changes, and it uses less than double the amount of storage the files take up. You can also enable compression, which I do, so it’s even smaller.