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Feedback on my off-site backup strategy (feddit.org)

submitted 1 month ago* (last edited 1 month ago) by Peluri96@feddit.org to c/selfhosted@lemmy.world

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Hey all, i would like to get some feedback on my backup strategy.

I have a debian webserver with a ZFS pool running nextcloud aio, immich and jellyfin. Thinking about adding other services as well but nextcloud and immich are the most important ones. The docker volumes of these services point of course to the zfs pool. My backup strategy would now be to use the internal backup solutions for nextcloud and immich to backup their databases, then stop the docker containers and do a borg backup of the zfs pool. The backups would be stored an extern hard drive (I want to expand on this but for now this is all I can afford). is this a viable approach or do i miss something? Could there be problems in case of a backup with the databases etc? The docker compose files are also stored on another machines together with my server documentation.

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[–] francisco_1844@discuss.online 1 points 1 month ago (1 children)

Suggest:

Frequent ZFS snashots. There are scripts to make this easier like zfsSnap
Two external backups which you rotate weekly [1]
Instead of borg backup of ZFS pools if you have another machine you could sync the volumes to another machine or even use rsync to another machine of the data [2]

You did not mention where the target of the borg backup is, but you want an external service. I believe there is a service that works wells with borg backup, but have not used it.

Notes [1] Spinning disks are affordable. I suggest at least 2 because if you only have one and your machine was compromised, think disk encrypting malware, you disk may be encrypted too. Also, if the disk dies there goes your external drive backup

[2] If you have another machine with enough space to host a copy that is a good option. Also, there are services that offer backup/disk VMs. They have very slow CPUs and affordable disk. Those may be work checking

[–] Peluri96@feddit.org 1 points 1 month ago* (last edited 1 month ago) (1 children)

You did not mention where the target of the borg backup is, but you want an external service. I believe there is a service that works wells with borg backup, but have not used it.

I did write that the borg backups would be stored on an external drive, sorry that this point wasnt clearer.

I basicly for the start have one big usb 20tb hdd drive (it was discounted and costed only little more than the 12 tb same brand one) to store my backups and i plan to get more drives when i can afford them. The idea with an additional machine i had as well, but thats maybe something further down the road.

the question is that for the start, if a borgbackup of the zfs pool on an external drive with all those services would work. I am a bit worried about their databases yucking up or something.

[–] francisco_1844@discuss.online 2 points 1 month ago

You still need some means of outside backup. Figure what you have covers majority of scenarios, so now we are getting into the highly unlikely, but highly impact full like "my house burned down and now I have no data". Something like B2 (or some other block storage with comparable pricing) is worth exploring.

You also need to consider your usage pattern like whether you may need to retrieve data (some providers charge for bandwith in / out). I would suspect most of the time between your ZFS snapshots and your disk you are covered.

Also, recommend to not leave the disk plugged in at all times for the scenario I mentioned: Your machine is compromised and the attacker encrypts data to ask for ransom; very low probability (I suspect those are mostly against companies), but really doesn't hurt to prevent against it.