PBS on Debian

Jun 29, 2021
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We're looking into hiring a VPS to have completely up to date offsite backups. Currently we're moving USB HDDs around but and we'll keep doing those to have airgapped backups but we'd like a more immediate restore option for the server rack burned down scenario.

The VPS would be provided by one of our ISPs in its dedicated datacenter with a direct line to our network. Unfortunately they're being stubborn about ISOs that are not fully vetted by their compliance dept and I'm like "dude, Proxmox is a tier 1 player" and they're like "I know, don't shoot the messenger".

So one workaround I came up with would be to have them set up the VM with Debian and us installing PBS on top of that. This part of the documentation says it's possible:
https://pbs.proxmox.com/docs/installation.html#install-proxmox-backup-server-on-debian

But it warns:
Caution

Installing Proxmox Backup on top of an existing Debian installation looks easy, but it assumes that the base system and local storage have been set up correctly. In general this is not trivial, especially when LVM or ZFS is used. The network configuration is completely up to you as well.

Does anyone know what specifically is meant by "base system and local storage have been set up correctly"? What would be an incorrect setup? Is there a situation where Debian is working fine but it is incorrectly set up as far as PBS is concerned?

And what is meant by network configuration other than the usual assigning of IP address, hosts and open ports in firewall?

Thanks so much in advance!