Hi,
I am having an issue with a backup job with PBS.
So right now I have 1 VM and 2 CT, my VM and my CT are backing up fine.
However the other CT (running cloudflare and nginx for a reverse proxy) does not backup.
I tried tinkering with the backup job parameters, looking on proxmox forums, reddit, and googling but I cannot find a solution.
I am not at all an expert, I have basic IT knowledge so I may have missed something.
I think the relevant logs are those, I guess it's a nginx cache file causing a problem but I'm too afraid to mess my nginx installation if I modify anything.
Below are the full logs concerning the CT causing problems
Thanks
I am having an issue with a backup job with PBS.
So right now I have 1 VM and 2 CT, my VM and my CT are backing up fine.
However the other CT (running cloudflare and nginx for a reverse proxy) does not backup.
I tried tinkering with the backup job parameters, looking on proxmox forums, reddit, and googling but I cannot find a solution.
I am not at all an expert, I have basic IT knowledge so I may have missed something.
I think the relevant logs are those, I guess it's a nginx cache file causing a problem but I'm too afraid to mess my nginx installation if I modify anything.
Code:
INFO: Error: error at "var/lib/nginx/proxy/2/91"
INFO: Caused by:
INFO: EBADMSG: Not a data messageBelow are the full logs concerning the CT causing problems
Thanks
Code:
INFO: Backup finished at 2026-01-09 02:02:31
INFO: Starting Backup of VM 101 (lxc)
INFO: Backup started at 2026-01-09 02:02:31
INFO: status = running
INFO: backup mode: stop
INFO: ionice priority: 7
INFO: CT Name: gateway
INFO: including mount point rootfs ('/') in backup
INFO: stopping virtual guest
INFO: creating Proxmox Backup Server archive 'ct/101/2026-01-09T01:02:31Z'
INFO: set max number of entries in memory for file-based backups to 1048576
INFO: run: lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- /usr/bin/proxmox-backup-client backup --crypt-mode=encrypt --keyfd=11 pct.conf:/var/tmp/vzdumptmp215558_101/etc/vzdump/pct.conf root.pxar:/mnt/vzsnap0 --include-dev /mnt/vzsnap0/./ --skip-lost-and-found --exclude=/tmp/?* --exclude=/var/tmp/?* --exclude=/var/run/?*.pid --backup-type ct --backup-id 101 --backup-time 1767920551 --entries-max 1048576 --repository pbs@pbs@192.168.1.16:TrueNAS
INFO: Starting backup: ct/101/2026-01-09T01:02:31Z
INFO: Client name: pve
INFO: Starting backup protocol: Fri Jan 9 02:02:35 2026
INFO: Using encryption key from file descriptor..
INFO: Encryption key fingerprint: xx:xx:xx:xx:xx:xx:xx:xx
INFO: No previous manifest available.
INFO: Upload config file '/var/tmp/vzdumptmp215558_101/etc/vzdump/pct.conf' to 'pbs@pbs@IP:8007:TrueNAS' as pct.conf.blob
INFO: Upload directory '/mnt/vzsnap0' to 'pbs@pbs@IP:8007:TrueNAS' as root.pxar.didx
INFO: unclosed encoder dropped
INFO: closed encoder dropped with state
INFO: unfinished encoder state dropped
INFO: catalog upload error - channel closed
INFO: Error: error at "var/lib/nginx/proxy/2/91"
INFO: Caused by:
INFO: EBADMSG: Not a data message
INFO: restarting vm
INFO: guest is online again after 28 seconds
ERROR: Backup of VM 101 failed - command 'lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- /usr/bin/proxmox-backup-client backup '--crypt-mode=encrypt' '--keyfd=11' pct.conf:/var/tmp/vzdumptmp215558_101/etc/vzdump/pct.conf root.pxar:/mnt/vzsnap0 --include-dev /mnt/vzsnap0/./ --skip-lost-and-found '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' --backup-type ct --backup-id 101 --backup-time 1767920551 --entries-max 1048576 --repositcachepbs@pbs@IP:TrueNAS' failed: exit code 255
INFO: Failed at 2026-01-09 02:02:59
INFO: Starting Backup of VM 103 (lxc)