Well...it all depends on what you want...then you look for/find a program that allows you as a user to do those things in the way that you want.
For example, I don't believe in incremental backups, preferring to backup everything at a given point in time. So, I use Drive Image 2002, which does this very well and is compatible with XP.
The problem that I have with incremental, automatic backups...what happens if there is malware on your system (undetected) during one of those...all future utility of the backup is thereby potentially questionable, if not damaging.
The only advice I can give is...find software that does what you want, the way that you want it...and employ that
Have you read the instructions for using the Acronis software which accompies your drive?