Hi! Control + Z is one of the big “missing pieces” in Appfarm. It’s complex due to the model-driven multiuser architechture. However, it’s been designed and is on the roadmap!
Most solutions, however, should have “Automatic snapshots” enabled. You find Automatic snapshots in the deploy menu. Automatic snapshots are full backups of the whole solution.
The most recent snapshot should be no older than 3 minutes from the last change (normally approx 1 minute old), and you may apply the snapshot in Develop using the “Apply snapshot” Icon. Note that we also recommend taking some manual backups once in a while (and label them with a comment). Read more here.