Suspend backup failes (rsync exit code 23)

[Alianaa]

Hi,

I have a brandnew turnkey nextcloud container (updated to nextcloud 22) with basically no data inside.
I have done a suspend-backup before update (to PBS, but I do not think its relevant).
After the update, the backup in suspend mode fails:

Header
Proxmox
Virtual Environment 7.0-11
Container 103 (pcNextcloud) on node 'homeserveraugsburg'
Filter VMID
Logs
()
INFO: starting new backup job: vzdump 103 --storage pvPBS101 --node homeserveraugsburg --mode snapshot --remove 0
INFO: Starting Backup of VM 103 (lxc)
INFO: Backup started at 2021-11-13 15:45:57
INFO: status = running
INFO: CT Name: pcNextcloud
INFO: including mount point rootfs ('/') in backup
INFO: mode failure - some volumes do not support snapshots
INFO: trying 'suspend' mode instead
INFO: backup mode: suspend
INFO: ionice priority: 7
INFO: CT Name: pcNextcloud
INFO: including mount point rootfs ('/') in backup
INFO: starting first sync /proc/603757/root/ to /var/tmp/vzdumptmp620542_103
INFO: first sync finished - transferred 2.61G bytes in 136s
INFO: suspending guest
INFO: starting final sync /proc/603757/root/ to /var/tmp/vzdumptmp620542_103
INFO: resume vm
INFO: guest is online again after 17 seconds
ERROR: Backup of VM 103 failed - command 'rsync --stats -h -X -A --numeric-ids -aH --delete --no-whole-file --inplace --one-file-system --relative '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' /proc/603757/root//./ /var/tmp/vzdumptmp620542_103' failed: exit code 23
INFO: Failed at 2021-11-13 15:48:37
INFO: Backup job finished with errors
TASK ERROR: job errors

In Stop mode, its successfull:

Header
Proxmox
Virtual Environment 7.0-11
Container 103 (pcNextcloud) on node 'homeserveraugsburg'
Filter VMID
Logs
()
INFO: starting new backup job: vzdump 103 --node homeserveraugsburg --mode stop --storage pvPBS101 --remove 0
INFO: Starting Backup of VM 103 (lxc)
INFO: Backup started at 2021-11-13 15:49:25
INFO: status = running
INFO: backup mode: stop
INFO: ionice priority: 7
INFO: CT Name: pcNextcloud
INFO: including mount point rootfs ('/') in backup
INFO: stopping virtual guest
INFO: creating Proxmox Backup Server archive 'ct/103/2021-11-13T14:49:25Z'
INFO: run: lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- /usr/bin/proxmox-backup-client backup --crypt-mode=encrypt --keyfd=14 pct.conf:/var/tmp/vzdumptmp623662_103/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 103 --backup-time 1636814965 --repository root@pam@192.168.178.33:backup
INFO: Starting backup: ct/103/2021-11-13T14:49:25Z
INFO: Client name: homeserveraugsburg
INFO: Starting backup protocol: Sat Nov 13 15:49:36 2021
INFO: Using encryption key from file descriptor..
INFO: Encryption key fingerprint: af:2d:4b:3c:6a:30:80:b5
INFO: Downloading previous manifest (Sat Nov 13 14:50:04 2021)
INFO: Upload config file '/var/tmp/vzdumptmp623662_103/etc/vzdump/pct.conf' to 'root@pam@192.168.178.33:8007:backup' as pct.conf.blob
INFO: Upload directory '/mnt/vzsnap0' to 'root@pam@192.168.178.33:8007:backup' as root.pxar.didx
INFO: root.pxar: had to backup 1.38 GiB of 2.43 GiB (compressed 517.57 MiB) in 139.59s
INFO: root.pxar: average backup speed: 10.14 MiB/s
INFO: root.pxar: backup was done incrementally, reused 1.05 GiB (43.1%)
INFO: Uploaded backup catalog (2.78 MiB)
INFO: Duration: 139.77s
INFO: End Time: Sat Nov 13 15:51:56 2021
INFO: restarting vm
INFO: guest is online again after 156 seconds
INFO: Finished Backup of VM 103 (00:02:36)
INFO: Backup finished at 2021-11-13 15:52:01
INFO: Backup job finished successfully
TASK OK

I cannot use Stop mode for my private nextcloud. It will grow in size and then the downtime is probably to long.