How much space for a PBS machine?

[BerndDasBrot]

Let's say I have a Proxmox system with a 8 TB VM (to store all my data, e.g. photos, videos, music etc.) on a 8 TB SSD

How much storage would a backup server need to back that VM up? Would another 8 TB SSD suffice? Or do the backups require even more space?

(I don't need to keep multiple backups of that VM, just one would be enough I guess).

 

[dcsapak]

How much storage would a backup server need to back that VM up? Would another 8 TB SSD suffice? Or do the backups require even more space?

well generally a pbs backup should not use more data than the original data (there are some edge cases, e.g. when the source is on zfs and can be highly compressed)
but basically the data will be zstd compressed and saved. there is a little bit of overhead but not much.

if you're not using the 8TB 100% then i think a 8TB disk should suffice