[zupreme]

There are some good suggestions here but I will give you one based on the assumption that your parents won't want to leave the familiarity of Windows.

0) Deny them admin rights to the machine. 1) Create a second profile for each of them 2) Write a quick batch or PowerShell script to copy the contents of their Desktop, Documents, Favorites, Pictures, Music, and Vidoes folders (not the entire profile) from their profile to the second profile you created for each of them. Make sure your script only copies new or changed items (so it runs faster) Store this script outside of either profile. 3) Schedule the script to run every hour on the hour. 4) In the event that they brick their profile with adware, malware, etc, simply login as an administrator, delete the first profile, rename the second profile to whatever the first one was called and then create a backup profile with the same username that the previous backup profile had (so you don't have to edit your script).

Notes: For your script if you are more comfortable with batch scripting then use "Robocopy". If you are more comfortable with PowerShell use "copy-item". I cannot stress enough how important it is that you ONLY copy the folders I mentioned above. If you get lazy and copy the entire profile you will bring over the folders viruses, adware, and malware hide in (like AppData). For the love of God make sure you have up to date antivirus on the machine. That's so basic that I didn't mention it above but I feel compelled to do so here. If you don't want to spend money just install Security Essentials or AVG.

[hayleox]

I'm gonna have to disagree with this one. There are tons of great, battle-tested backup tools out there -- rolling your own solution seems to just be asking for something to go wrong.

[zupreme]

This isn't backup. It's user profile element duplication on the same machine. As long as they are not admins or power users on the system then they can't do much damage outside of their profiles.

Backup is another matter entirely.