First you need to check the performance of your storage, yo can test it with fio command
https://pve.proxmox.com/wiki/Benchmarking_Storage
Also you can try
pveperf
For example
pveperf /var/lib/vz
Is not a good idea making backups in different datastores as you miss the dirty bit, so every time you do a backup weekly or monthly is a new copy not incremental.
The existing storage network is not affected. You only need to add a network that can communicate with your PBS, and when you add /modify the PBS storage it will try to reach the PBS by the new IP address.
There are some several escenarios for your approach:
1) You can use a firewall like Pfsense/Opnsense to connect it directly to your wan connection of any way (ppoE, DHCP, etc) for this you need to know what is the method for doing this. After...
This is a known issue after upgrade due changes made to systemd defaults. As shown in this section of the upgrade process, audit logging is disabled by default in Bookworm, and in Trixie this audit log is enabled.
systemctl disable --now...