I\'m working on a project:
1) Once the version control system is set up, it will make your life so much easier. Manually backing up your source changes? Oh man, please no. What a PITA.
With version control in place, you just fire off a command. It tracks what changes and makes it easy to save them.
Why would you want to punish yourself by manually handling version control? Using git to track local changes is SO easy. Easy to set up also.
2) Keeping track of the history. Keeping a history of commits manually will almost immediately get out of hand.