Wiki backup not backing up Tags

I've looked inside the wiki backup Zip file that the backup creates and I can't see that any Tag information is being backed up i.e. the Tags themselves are not backed up, and neither are the Tags assigned to pages.

This makes the backup slightly flawed and incomplete.

I would agree that we can't expect to backup absolutely everything about a wiki, but I would suggest that Tags are an essential part of a backup (and also that it is not too difficult to implement?).