I've got an SVN repository of a PHP site and the last programmer didn't use source control properly. As a result, only code since I started working here is in the Repo.
I have a bunch of old copies of the full code base saved in files as "backups" but they're not in source control. I don't know why most of the copies were saved nor do I have any reasonable way to tag them to a version number. I do have the dates the backups were made, all backups have proper file system timestamps.
Due to upgrades to the frameworks and database drivers involved, the old code is quite defunct; it no longer works on the current server configuration. However, the previous programmers had some unique logic, so I hate to be completely without old copies to refer to what on earth they were doing.
Should I keep this stuff in version control? How? Wall off the old code in separate Tags/branches?