onedev lxc failing backups to nfs shared drive

[vacquah]

Deployed onedev via lxc with default options. The backup job to a shared nfs drive fails consistently with the error message below. Other LXC containers deployed manually work fine.

Initially, I got this error message ( after fresh install )

INFO: CT Name: onedev
INFO: including mount point rootfs ('/') in backup
INFO: temporary directory is on NFS, disabling xattr and acl support, consider configuring a local tmpdir via /etc/vzdump.conf
INFO: starting first sync /proc/3915153/root/ to /mnt/pve/nas2-backup/dump/vzdump-lxc-220-2025_02_17-09_14_35.tmp
ERROR: rsync: [generator] chown "/mnt/pve/nas2-backup/dump/vzdump-lxc-220-2025_02_17-09_14_35.tmp/." failed: Operation not permitted (1)
ERROR: rsync: [generator] chown "/mnt/pve/nas2-backup/dump/vzdump-lxc-220-2025_02_17-09_14_35.tmp/bin" failed: Operation not permitted (1)

Then, I tried setting up a tmp folder by adding tmpdir: /var/tmp/ to /etc/vzdump.conf of the lxc container and main pve host. Didnt work. However the error message now looks like this:

INFO: CT Name: onedev
INFO: including mount point rootfs ('/') in backup
INFO: starting first sync /proc/3915153/root/ to /var/tmp/vzdumptmp4026535_220/
ERROR: rsync: [generator] set_acl: sys_acl_set_file(var/log/journal, ACL_TYPE_ACCESS): Operation not supported (95)
ERROR: rsync: [generator] set_acl: sys_acl_set_file(var/log/journal/b6af2832a2704b1caa27606859f5885f, ACL_TYPE_ACCESS): Operation not supported (95)
ERROR: rsync: [receiver] set_acl: sys_acl_set_file(var/log/journal/b6af2832a2704b1caa27606859f5885f/.system.journal.2m75ZY, ACL_TYPE_ACCESS): Operation not supported (95)
ERROR: rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1338) [sender=3.2.7]
ERROR: Backup of VM 220 failed - command 'rsync --stats -h -X -A --numeric-ids -aH --delete --no-whole-file --sparse --one-file-system --relative '--exclude=/tmp/?*' '--exclude=/var/tmp/?*' '--exclude=/var/run/?*.pid' /proc/3915153/root//./ /var/tmp/vzdumptmp4026535_220/' failed: exit code 23
INFO: Failed at 2025-02-17 12:04:24
INFO: Backup job finished with errors
TASK ERROR: job errors