I have been using Truenas for over a year, but very new to zfs snapshots and replications etc. I have read a few posts, but haven’t found a answer for this yet. My setup is as per below: Prod: TrueNas scale 24.04.2 64GB ram 2 x 16TB drivers in a mirror (14.45 TB total usable space) Local back…

Tick the “save pending snapshots” box in the replication task. Pending snapshots will then only be deleted after they are replicated, even if they have expired.

[image] Sunny: My question is, since the snapshot lifetime is only set to 1 week, if my backup machine doesn’t turn on for more than a week, will some data not be backed up? Exactly. Backup will stop working entirely. If source and destination do not have a common snapshot, incremental replic…

[image] Stux: Pending snapshots will then only be deleted after they are replicated, even if they have expired. TIL, thanks.

This is exactly what I was looking for. Thank you. Is it worth ticking the “Replication from Scratch” checkbox? [image]

You don’t want to tick that. It will erase the destination if necessary, and start from scratch if there are no base snaps. I think it’s better to have an error in the case, so you can take action… for example, by replicating from scratch, and then once recovered, disabled again.

Is it fair to surmise that it only helps in that way if you do push replication because it only keeps snapshots tied to specifically FAILED tasks and only the source would have all that information available to it?

Think so. But I haven’t tested pull.

ZFS snapshot lifetime and replication to another system

TrueNAS General

winnielinnie July 12, 2024, 12:52pm 9

If only this was an integrated fallback. If only…

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ZFS snapshot lifetime and replication to another system

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