I have not had a lot of experience dealing with clusters and I am curious as to what the tips and tricks are for backing up a cluster sql 2005...is there anything new or different from backing up a standalone server?
Regarding the MSSQL virtual server, just ensure the backup volume is configured in MSCS so that all nodes of the cluster can access the volume; how-to dependency - http://msdn2.microsoft.com/en-us/library/ms177447.aspx