I’ve been working in IT for about 6/7 years now and I’ve been selfhosting for about 5. And in all this time, in my work environment or at home, I’ve never bothered about backups.

That really is quite a confession to make, especially in a professional context. But good for you to finally come around!

I can’t really recommend a solution with a GUI but I can tell you a bit about how I backup my homelab. Like you I have a Proxmox cluster with several VMs and a NAS. I’ve mounted some storage from my NAS into Proxmox via NFS. This is where I let Proxmox store backups of all VMs.

On my NAS I use restic to backup to two targets: An offsite NAS which contains full backups and additionally Wasabi S3 for the stuff I really don’t want to lose. I like restic a lot and found it rather easy to use (also coming from borg/borgmatic). It supports many different storage backends and multithreading (looking at you, borg).

I run TrueNAS, so I make use of ZFS Snapshots too. This way I have multiple layers of defense against data loss with varying restore times for different scenarios.