We have a QNAP NAS and we have mount one of it's folder into Zimbra as a NFS storage for Zimbra Backup. However, this volume is not shown on Server Statistics > Zimbra.domain.com > Disk. Any idea?

Also, when we amend the folder properties in QNAP (configure no access for guest account), the backup content is no longer visible from Zimbra.

btw, what is the default zimbra password in Linux? We always use root to sudo to zimbra account.