Sure, neither of these work:
mount -t cifs -o username=***,password=***,vers=1.0 //192.168.5.1/dietpi /mnt/Backups
mount error(95): Operation not supported
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
mount -t cifs -o username=***,password=***,vers=2.0 //192.168.5.1/dietpi/ /mnt/Backups
mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
Dmesg gives more:
[ 393.947414] CIFS: Attempting to mount //192.168.5.1/dietpi
[ 394.434826] CIFS: VFS: \\192.168.5.1 Dialect not supported by server. Consider specifying vers=1.0 or vers=2.0 on mount for accessing older servers
[ 394.434992] CIFS: VFS: cifs_mount failed w/return code = -95
[ 394.510835] CIFS: Attempting to mount //192.168.5.1/dietpi
[ 394.515860] CIFS: VFS: \\192.168.5.1 Dialect not supported by server. Consider specifying vers=1.0 or vers=2.0 on mount for accessing older servers
[ 394.516001] CIFS: VFS: cifs_mount failed w/return code = -95
[ 394.592814] CIFS: Attempting to mount //192.168.5.1/dietpi
[ 394.597957] CIFS: VFS: blob signature incorrect \xa1\x81\xa40\x81\xa1\xa0
\xa1
+\x827
\xa2\x81\x8b\x81\x88NTLMSSP