This is so wrong. :) With git you exactly do not have to backup your local workspace, because it already is backed up in git.
If it is committed, it is safe. You can go back to it. If you messed up your branch, just reset it to something that was good. No need to do manual backups.
If it is committed, it is safe. You can go back to it. If you messed up your branch, just reset it to something that was good. No need to do manual backups.