Greetings to all!
For those interested, I found in a discussion list on Facebook a how-to article signed by Derek Seaman.
I upgraded my PBS following “Automated Proxmox Backup Server 2.4 to 3.0 Upgrade” and everything went without problems.
I haven’t tried “Automated Proxmox 7.4 to 8.0 Upgrade” yet, but considering how the process went for PBS, I don’t think there will be any problems.
The blog is interesting.