This is something every webmaster would love to use.. but didn't know existed.

There is a tool named "CVS" which can be used to save all versions of your program. You initially start with a set of source code files, and the project grows from there on. If you make a mistake you can always restore the changes you made from the previous version you added to the "CVS".

During a website's lifetime, a lot of code keeps changing, and more often than not, some code causes a problem in the rest of your website. Using CVS would help to detect where you slipped in those "Bugs". Agreed, CVS may be a little difficult to use at first, but once you're used to it like I am, you'll love the fact that you have EVERY version of your website from the day it was born!

I won't go into details aboout how you can set up CVS or use CVS, you can always google for it. You either need a linux system, or cygwin installed on windows, to use CVS. you can also configure to use this service on a remote server.. that also adds to your disaster recovery strategy