Backup to 3 different USB rotated external disk

[guerro]

Hi! I'm pretty new to the world of proxmox and for work needs i'm trying to figure out how I may be able to use a set of 3 different USB disk in rotation (1 per week) for off-site backup. I've understanded that there's no integrated way to achieve this and i've already tried looking at others thread but no answer was complete or satisfactory.
I'm currently running PBS under a VM in PVE, only 1 node, and i should backup the other 3 VMs in PVE.

Wish i've provided all the details needed, in case others are needed I will provide them.

Thanks in advance for your answers

 

[Dunuin]

If your PBS is using ZFS there are many scripts you could use that are using snapshots to incrementally sync your datasets to rotating external disks.
If you don't use ZFS you could just use rsync to copy everything over to the external disks.