Proxmox VE - TASK ERROR: CT is locked (snapshot-delete)
During an issue with a defective storage solution, I had temporarily (as in not added to fstab) mounted an external USB disk under /mnt/usb-disk
on a Proxmox server to keep the backups flowing. A day and a reboot later, those backups started to fill up the local storage instead with unfortunate consequences. As they say, you really can’t fix stupid.