What's simple is backing up (and verifying) what's changed since the last verified backup. Backing up the 90% of files on your computer that have not changed is an invitation for something to go wrong.
Ummm, like what?
I trust simple... and smart ;-)
I don't image my system drive very often. Even if I restored a 3 month old image, I just have to run a few software updates. I don't keep any of my data on the system drive.
My system drive is fully backed up at the beginning of each month, differentials once a week and an incremental on the other 6 days of the week in the morning.
If I try a new program and decide I don't want it, I can just restore the computer to that morning's backup. I don't need to worry about not being able to fully uninstall a program.
If a Windows update has a problem, I just restore the computer to the state before the update.
If the disk fails, I can quickly restore the operating system to a new disk without spending time updating program files and loading and updating Windows required by a three-month-old backup.
Having very recent backups just simplifies restoring a computer and saves unnecessary work.
An added bonus is that you can open any backup and retrieve any files that you may have accidentally deleted.