could you try using smb version 2.1
mount -t cifs -o username=***,password=***,vers=2.1 //192.168.5.1/dietpi/ /mnt/Backups
could you try using smb version 2.1
mount -t cifs -o username=***,password=***,vers=2.1 //192.168.5.1/dietpi/ /mnt/Backups