Timely and very valid advice................I backup my entire drive, OS and all using CasperXP about once a week and that really isn't often enough.
The best thing about CasperXP is I can rip the drive out of my laptop and fit the backup drive and it will boot and run with no change or difference at all.
If my PC dies or is stolen or I throw it out the window I just need to slot the backup drive in a new machne and I am up and running in minutes.