Currently the Plug-in for SQL Server allows you to Rename/Relocate at the Database level.
You can only use a single SQL Server installation to create multiple instances and configure
authentication differently for each instance, NetVault Backup supports the use of different
authentication information for different instances. If you only create one instance, that node is labeled
“(local).”
This is a request to allow the plug-in to be able to Relocate (and perhaps rename using a prefix or a suffix) multiple databases at the same time. I.e., 'all' the databases under an instance, or 'all selected' databases (i.e., crossed out databases will be not restored/relocated/renamed)