Backup files

Greetings.
I've got a little bit of problem with writing a script.
I'd like to write a script that creates backup files (of your computer) once a week, and on the other days of the week it just updates it.
Thanks in advance i hope you can help:
buddhist

p.s.: this would help a lot, because i hate saving files

Hope you are speaking about incremental backup.

More than writing a script for this, you can look at rsync.