Software for taking daily backup

[Jatin]

Hi

I am looking for a backup application to run on my ubuntu 10.04 laptop 
which can take backup in the following way:

I want the application to take the entire folder as backup and then,
it should check to see which files has changed from the backup that is 
stored already and then
only do a backup of the file that has changed and leave the rest of the 
files untouched.

Please suggest some applications that can do this for me.

Thanks
Jatin