Before making each change, my team's 'architect' (almost hard to say without laughing/crying) copies her entire checkout folder to a backup folder she has created... painstakingly numbering each backup by date and time. Her explanation: this way she'll be able to revert anything that goes wrong.

So yeah, not real sure why we bother with ClearCase when we have team members implementing ad hoc, informally-specified, bug-ridden, slow implementations of half of Git.