How do I simple Track my modification style/file/templates?

[Masiello]

This believe it is a recurring question that we asked when new vB versions coming,
well, the question is: How do I keep the track of all my modification that I redo after the board upgrade? Happen too that we forgot sometimes of what Template and/or PHP files modification we have made for some product or a normal template or a vBulletin files modification that for some thing we need to do.

For example:

• Welcome Header need a quick/small template modification
• The Paul Cron Email addon need some modification in mail.php (that if changed in a new vb releases it be overwriting by a new version, and if we forgot that addon end to work)
• Tracking Guest Visit need template modification
• The Princeton footer modification and etc... etc...

Now, what is the best and simple mode to make a good Track that we used simple after the style and forum upgrade?

Is there anyway? Any suggestion I believe possible coming from vb.org team based on the method they used when upgrating their board.

Sorry my english