[TxMt] Backup files

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I may have missed this as a feature request, but just found the need for a backup version of a a file I was working on. What I wanted to do was use diff on the backup and the new version so I could easily record the changes to my work log.

Anyway, so I was hoping that a future TextMate preference might allow save to backup like BBEdit (to name one).

I was sort of thinking of something like Borgware posted a while ago: http://borkware.com/quickies/one?topic=NSDocument

override NSDocument's keepBackupFile: - - (BOOL) keepBackupFile { return (YES); } // keepBackupFile

This will do the tilde thing to the older version of the file.

Cheers Robert