RAID Version & Backup advice please

Need some quick pointers please!
New 2003 R2 server - SAS discs on a RAID dual channel card but have the
option from HP of either using 3 discs in Raid 5 array or 4 in a Raid 6
Array - any views on speed, reliability, justifiability, etc (I am aware it
costs one extra disc!) We were thinking of just one Raid array with
partitions on it, rather than separate arrays to avoid the disc numbers
going out of control although there is space for 8 to start with.
Also, for backup, as well as burning DVD's of data to offsite, I have looked
at Paragon DriveBackup Small Business server edition - it appears to provide
a drive image as well as incremental which seemed a good idea in case needed
to restore completely. Any views on this product (or others) and whether to
use it to a "spare" SAS or SATA disc in the server, or onto NAS etc?, its
purpose would be to deal with major software corruption or raid failure as
opposed to theft/loss of the server which the off-site DVD's cover.
Thanks


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