Sure thing—autofs is a pretty cool utility and it works with SMB as well.

If the storage isn’t present for PBS, the backup would fail. There are files inside the directory that PBS will notice are missing.

Mounting the NFS export in the PVE host is the simplest way to get shared storage into an LXC container. You have to fight apparmor to mount NFS or SMB inside the container directly.

No, I used an unprivileged container and I set the permissions on the NFS server to accommodate that.

I use it like I might use unbound or dnsmasq, but I’d think of it more like bind. It’s can be used as a recursive or authoritative resolver. It supports all kinds of protocols (DOT, DOH, DNSSEC, etc). Handles zone transfers easily. It’s pretty slick. Definitely worth a look

If you’d like some separation, one option is to create a VM on TrueNAS for PBS that connects to an NFS export where all the data would be stored.

What I did in this scenario is an LXC container running PBS, which uses a bindmount for storage. That bindmount is populated via an NFS export from my NAS, mounted on the PVE host using autofs so that if it disconnects, it will reconnect as soon as it can.

Technetium is a recursive DNS resolver with a nice web UI. If you’re familiar with PiHole or AdGuard Home, you can think of it in that genre, but much more full-featured.