backup strategy

We're rotating external usb disks offsite.

Thats for DR. App data is backed up online.
 
what's the best strategy for backup?

To use an external NAS?
Hi,
depends on the usage - I have on some systems an raid-1 with 2TB-Disks for the system (100GB) and all other space for backup.
I use links to get an folder for each node and use rsync to copy the content to the other node.
Like this:
Code:
/backup/dump -> /bckup/proxmox-a

ls /bckup
proxmox-a
proxmox-b
proxmox-c
The daily backup is done by bacula - the pve-backup is for desaster recovery and special use cases only.

Udo