Help needed

[BALAJI :)]

Hi,
I am using Debian Lenny, kernel version: 2.6.26-1-686.
I am very new to linux.
Can you please let me know the steps for backing up my linux PC (maybe to a
CD) and later restoring from it when required.
Also let me know if I can install any Open source S/W that can do the above
task (something like scheduled backup).
Thanks in Advance,
*BALAJI*