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ZFS backup strategy (lemmy.sdfeu.org)

submitted 11 months ago* (last edited 11 months ago) by biscuits@lemmy.sdfeu.org to c/datahoarder@lemmy.ml

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Hello,

I've been lately thinking about my backup strategy as I'm finalising building my NAS. I want to use ZFS and my idea was to have two drives in mirror (RAID-1) configuration and just execute periodical snapshots on such dataset. I want to the same thing in a second location, so in the end my files would be on 4 different drives in 2 different locations and protected by snapshots from deletion or any other unwanted modification.

Would be possible with this setup to just swap one of the drives in one location and have ZFS automatically rebuild data on the new drive and then I take the drive to second location and do the same so all drives would be exactly the same, instead of copying data manually? Though I believe all of the drives would need to be exactly the same size, is that right?

Is it a good idea in general or should I ditch it, or maybe just ditch the part with ZFS rebuilding and use instead some kind of software for that?

Thank you for your help in advance!

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[–] biscuits@lemmy.sdfeu.org 1 points 11 months ago* (last edited 11 months ago) (1 children)

Thanks, I guess it's even better solution and doesn't involve kinda risky removing drives from pool. But do you think my strategy with snapshots as backup is good overall or should I use something else?

[–] PriorProject@lemmy.world 2 points 11 months ago (1 children)

Yeah, snapshots sent to a separate and often remote pool is an extremely common backup strategy for folks who have long-term settled on ZFS. There's very nice tooling for this that presents a more traditional schedule/retention based interface to save you scripting snapshots and sends directly.

Sanoid is an old standby in that space.
Zrepl is getting a lot of traction lately and seems to be an up-and-coming option.
I use pyznap, but I don't recommend it to others as as the maintainer is on a multi-year hiatus which makes it undermaintained. It works great, but isn't getting active development which makes it a poor bet in a crowded space with many great options. I plan to eval Zrepl when I get around to it.

[–] Nogami@lemmy.world 1 points 11 months ago

Sanoid works great. Very easy setup and no issues.