同一块硬盘，为什么CT模板创建的虚拟机不能备份，而ISO镜像创建的虚拟机却可以顺利备份，显示没有权限：Cannot open: Permission denied
具体错误为：
2023-03-16 17:09:17 INFO: creating vzdump archive '/mnt/pve/nfs/dump/vzdump-lxc-106-2023_03_16-17_09_17.tar.zst'
2023-03-16 17:09:17 INFO: tar: /mnt/pve/nfs/dump/vzdump-lxc-106-2023_03_16-17_09_17.tmp: Cannot open: Permission denied
2023-03-16 17:09:17 INFO: tar: Error is not recoverable: exiting now
2023-03-16 17:09:17 ERROR: Backup of VM 106 failed - command 'set -o pipefail && lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- tar cpf - --totals --one-file-system -p --sparse --numeric-owner --acls --xattrs '--xattrs-include=user.*' '--xattrs-include=security.capability' '--warning=no-file-ignored' '--warning=no-xattr-write' --one-file-system '--warning=no-file-ignored' '--directory=/mnt/pve/nfs/dump/vzdump-lxc-106-2023_03_16-17_09_17.tmp' ./etc/vzdump/pct.conf ./etc/vzdump/pct.fw '--directory=/mnt/vzsnap0' --no-anchored '--exclude=lost+found' --anchored '--exclude=./tmp/?*' '--exclude=./var/tmp/?*' '--exclude=./var/run/?*.pid' ./ | zstd --rsyncable '--threads=1' >/mnt/pve/nfs/dump/vzdump-lxc-106-2023_03_16-17_09_17.tar.dat' failed: exit code 2