On 10/04/2021 5:10 pm, Arjen via pve-user wrote:
Don't expect to be able to backup the PBS container with 4TB to a 2TB external
drive. The Datastore of a PSB does not compress much further and Proxmox VE
Backup will only backup virtual disks and not mountpoints or storages passed
from host, if I understand correctly.
I suggest adding a virtual disk of 2TB to the PBS container (and format it with
ext4) which can be backed up by the Proxmox VE Backup.
I would also run the PBS container (with virtual disk) on the cluster instead
on separate hardware which is a single point of failure. The local PBS would be
then just as reliable as your cluster.
Regarding safeness: I suggest doing a automated disaster recovery every week to
make sure it works as expected. Or at least partially, like restoring the PBS
from an external drive.
Regarding practicality: I would have a remote PBS sync with your local PBS
instead of moving physical disks (but you mentioned before that that was not
really possible).
Did some testing over the weekend.
* Setup a PBS Container with a 2TB root disk
* Backed up 6 VM's to it.
* Backed up the PBS Container to a external disk using vzdump (using
the std proxmox gui)
o Slooow process at 30MB/s :)
* Deleted the PBS Container
* Deleted the backup VM's
* Restored the PBS container from the external hard disk
o Much faster - averaged around 100MB/s
* Restored PBS Container started fine and verified.
* Restored the backed up VM's from the PBS Container
o Worked as expected
o All backup and running.
All in all, worked as I wanted and seems a viable option for full image
offsite backups via external hard disks.
The process of backing up the PBS container to the external drive is
*very* slow :( I estimate 11 hours for a full cluster backup copy. But
since its on a independent node, it doesn't load the main cluster and
can just happen over the weekend.
--
Lindsay
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