Backup Software for Multiple Computers?

I'm looking for a good inexpensive backup software that I can install on several different computers to back up to one external USB HDD. I need it to do manual on-demand incremental backups.

In other words I want to be able to do manual backups and only have it backup files that have been changed. I only need to backup certain folders like My Docs and some specific folders I have created. I don't need a full disk or OS backup. I just want something that will do it manually faster than sitting there and having to tell it whether to replace a particular file or not or the old "yes to all".

Thanks in advance.

Backup Software for Multiple Computers?house call

The only software (that I know of), that can do incremental backups is Acronis TrueImage. But it certainly isn't cheap.

http://www.acronis.com/

You can use the Windows backup utility to archive specific folders.

Backup Software for Multiple Computers?matchless

http://www.cezeo.com/purchase/