Creating database backup as virtual server admin fails

As a virtual server administrator, when you try to create a backup of a database, the process fails. It tries to write to /tmp/.webmin/"whatever" instead of /home/"virtualserver"/tmp - perhaps this is intentional wrt disk space/quota usage.

The database file appears to download in the browser, but then contains this:

"Database backup failed : mysqldump failed :

sh: 1: cannot create /tmp/.webmin/516924_6097_1_backup_db.cgi: Permission denied

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Just to clarify, the path to this is [Virtualmin Menu] > Edit Databases > Manage (a database), Backup Database.

Performing this same action as the Superuser admin works normally, as expected.