How do I back up my aspire ASE360-u-a3700 system

Do you want to save personal data, for a reinstall or security reasons, or would you like an entire back up of the computer that you can restore to boot.

I would like to back up whole system in case of virus or something... lost everything last time

DriveImage XML - Free software downloads and software reviews - CNET Download.com (http://download.cnet.com/DriveImage-XML/3000-2242_4-10443230.html?tag=mncol)

That's a reliable program. When you create the drive image, save it to an external hard drive, or an internal one you swear to use for no other purpose.

If your computer ever crashes again, it will put it back exactly as it was when the image was made. The only other tool you will need to use when restoring is Hiren's Boot Cd or something similar.