[March 2026] Proxmox Backup Client - Unofficial ARM64 Install for Ubuntu Server 25.10?

[SInisterPisces]

Hello,

I've got a couple of Pis running Ubuntu Server 25.10 (Ubuntu kernel 6.17).
Since these would otherwise be virtual machines but for Reasons® (mostly, they're running workloads that I want to stay running in the event my Proxmox cluster has some sort of catastrophic failure), I'd like to use Proxmox Backup Client to back these up to my existing Proxmox Backup Server, which has plenty of room and, perhaps most importantly, is already configured and working.

I know that there are a few different ways to get an ARM build of Proxmox Backup Client up and running, but I'm a bit overwhelmed trying to figure out which approach would be best for use on the ARM build of Ubuntu Server 25.10.

I'd appreciate any advice. Thanks!

 

[Johannes S]

I wouldn't use some unsupported built fo backing up important data.
Instead I would use a backup tool which works with ssh to create backups on a dedicated dataset beside your backup datastore.

For example restic works with sftp (and any cloud provider who supports s3) but also has it's own http-based server: https://github.com/restic/rest-server
You could install it beside the PBS on your PBS or create a lxc/vm with it in your regular Proxmox environment and afterwards back that up with PBS.
Another option would be rsnapshot which works with ssh and rsync and has the benefit of not storing data in a binary format (at the cost of additional needed sotrage) so you yould setup a rather basic lxc (alpine would propably be enough) with a ssh service to store your rsnapshots on. This rsnapshot lxcs would then be backed up with PBS (and will also profit from PBS deduplication that way): https://rsnapshot.org/
rsnapshot utilices hard links to save space, so even without PBS deduplication it would be quite cost-effective just not that much as PBS with compression+deduplication.
restic uses similiar mechanisms like PBS for deduplication and compression so I wouldn't nest their backups. But installing rest-server beside PBS should work. The developers provide a docker image (something you don't want to use on PBS) but also binary downloads which also can be easily updated with a self-update option. You will just need to create a dedicated user/group for running it together with a systemd service unit. The developers provide one in the examples subfolder of their repo.

So restic is great if you want to have a similiar feature set like PBS but want to be able to restore your backups without a running PBS instance (restic would also be able over a ssh connection or even if you attach the data disc to the machine you want to restore to). rsnapshot on the other hand is great for having the backups in a easily browsable format while still being able to use PBS for the (more space-efficient) longtime storage.
Imho proxmox-backup-server is best for vms and lxcs, for bare metal backups another backup tool is the better choice and of course there are more tools than rsnapshot or restic YMMV.