Eh, you really shouldn't do that for any kind of file that acts like a (an impromptu) database. This is how you get corruption. Especially when change information can be split across more than one file.
Sorry, what are you saying shouldn't be done? Backing up untracked/modified files in a bit repo? Or compressing the .git folder and backing it up as a unit?
Sorry, what are you saying shouldn't be done? Backing up untracked/modified files in a bit repo? Or compressing the .git folder and backing it up as a unit?