Restore Microsoft utility backup restore.

http://technet.microsoft.com/en-us/library/cc771973.aspx

Netbackup

http://www.symantec.com/connect/forums/backing-windows-2008-2-node-cluster-and-sql-server-2008

What is clustered on the Windows cluster? Filesystem? SQL? Exchange?

How are backups done for the clustered data?

How are backups done for non-clustered data?

Tricky one with Clusters - especially as sometime the Quorum Disk insists on its digital signature being the same as the original - if this ocurrs google it as you can do a registry change to put that right

In many respects it is pretty much like any other restore, plus the shared disks plus the Quorum ...

Restore the one node (build the node and do a full restore), restore the quorum (this tech note may help : http://www.symantec.com/docs/HOWTO70402),restore the second node, restore the shared disks.

Obviously during this process all hardware and disk must be made available for the restores to take place.

Sure someone will be along with more details soon but this is the basics - the most important part of this is the System State (Shadow Copy Components in 2008)

Hope this helps