No no no no no. :)

Whether you're working in a team or working by yourself: Use Subversion Anyway. Or svk. Or Darcs. Any reputable revision control system will kick the pants out of any ad-hoc solution you come up with. Revision control should be automatic and easy. The value of being able to easily merge changesets alone is reason enough for any non-trivial project. Keeping track of branches for experimental/delicate changes, tagging releases, LOG MESSAGES for all your changes - all of these things, use them, learn to love them. It's a bitch to get in the habit, but when you do it's absolutely worth it.

It's taken me over seven years to truly learn the worth of version control. These days I'd dare not live without it. It really is that good. Honest!