I am about to set up a new server running SBServer 2011.
The server will be the domain controller, file, web, exchange, antivirus (sophos), print, backup server - approx 30 users plus maybe 50 on the website.

I have eight drives, and will either go for RAID-5 or RAID-10.

I will be doing daily backups to USB drives, but will do monthly backups to the server drives (used only for if someone needs to restore something deleted months ago).

How should I work the array (one huge array or split it?) - Would it be beneficial to split into 2 arrays so the backup job runs from one set of drives to the other?

And any suggestions for partitioning? I am tempted to leave it as a huge C drive unless someone tells me that is a terrible idea in some way!