Issue with duplicate zfs sends

[florian-obradovic]

Hi and thank you very much the great work.

Unfortunately I'm struggling getting it to work with my use case:

• rpool with properties: -- autobackup:backup2thunder-970evo -- autobackup:backup2tank
• thunder-970evo pool as first target
• tank/encrptd/zfs-autobackup as second target

I want to backup my rpool to thunderbolt ssd (thunder-970evo) and also to a second pool. If I understand it correctly I need to create to groups backup2thunder-970evo & backup2tank.

My problem now is that zfs-autobackup wants to copy received datasets on thunder-970evo (with autobackup:backup2thunder-970evo) to my tank as well because the property backup2tank has been sent to thunder-970evo:

What could be a solution? Can we only transfer datasets where property is local / not received?

Thanks a lot and best regards!

[psy0rz]

Yes, you can use --exclude-received for that.

Which version of zfs-autobackup do you have? It should normally use that option automaticly if the backup is local. (e.g. if you do not specify ssh-source and ssh-target.)

[florian-obradovic]

Awesome, I'm afraid it doesn't work for me by default. zfs-autobackup --version zfs-autobackup v3.1.3 - (c)2021 E.H.Eefting (edwin@datux.nl)

I will try the --exclude-received option!

[florian-obradovic]

That works for me (but wasn't used automatically!)! Thanks a lot!

[florian-obradovic]

Is there also an option to only send received and don't create new snapshots so I can safe one group?

I'd like to pickup all snapshots from tank/encrptd/zfs-autobackup with property autobackup:backup2tank and send them to external usb-disk

My current workaround is --keep-source=0

• create snapshots for all data sets on tank and except for tank/encrptd/zfs-autobackup ( sudo zfs set autobackup:tank=false tank/encrptd/zfs-autobackup)
• never send these snapshots
• send autobackup:backup2external snapshots of tank to external pool

Is my approach wrong or too complicated? Basically I want a secondary target or source > stage 1 > stage 2 backup strategy without having too many / "duplicate" snapshots laying around.

Any hints? thanks.