[TUTORIAL] Fixing Proxmox Backup Hang Caused by NFS

Hello everyone, I want to share my experience dealing with a backup issue on my Proxmox server.
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I had a scheduled backup job, but the NFS storage I used had a network issue. This caused my backup to run for around 20 hours just for a 100GB thin-provisioned VM — even though the actual data inside the VM was less than 20GB.
Screenshot 2025-10-24 202602.png

To solve this issue, I went to the shell and unmounted the NFS storage using the following command:
Bash:
umount -f /mnt/pve/[mynfs-storage]

Screenshot 2025-10-24 203029.png
Then, I unlocked the VM with this command:
Bash:
qm unlock [vmid]

Screenshot 2025-10-24 202947.png
After that, the VM started working again.
Screenshot 2025-10-24 203053.png

Thanks!
I hope this helps anyone who faces a similar issue.
 
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