SBS 2003 Backup of RAID5 and AD problems.

Hi,

I have had the following problem and would like advice for the rest of our SBS 2003 servers.  A disk failed in the RAID5 array and caused AD corruption.  We have replaced the disk and rebuilt the array but when looking into AD repair I have a few questions.

The Micorosoft Article (KB258062) was very helpful and in short our AD had to be restored from tape backup.  This is where I being to worry, the article explains restore mode using system state and the sysvol directory.  Our tape backup has been using the SBS2003 builtin backup and this does not backup sysvol??!!  In the end I restore the system state and it fixed but for future reference would like suggestions on the following:

1.   Should we create a system image ever month or two months, if so any suggestions on software?
2.   Should we be using a different backup program and again any suggestions on which.

I am slightly apprehensive as to the integrity of the system as a failed drive should not cause corruption on another disk but in this case it has and we needed to restore.  If the system state had not worked we would have had to restore from scratch and this would have been time consuming and costly to the end customer.

Thanks in advance

Gareth.