My process of finding the best way to boot Proxmox off an NVMe drive in an old Dell R510

ZFS is a great filesystem which I use on most of my systems and it makes full-drive backups a breeze. However, sometimes I want to backup to a non-ZFS system. These are the steps I use for fast and verified backups to a file on another computer.

Changing a user's username on Linux requires no processes be running under that user. This makes sense, but what if we only have that user accessible through a SSh connection?