Three things called backup

The module's central lesson, resolving a confusion that wastes the time you do not have in a crisis: three different things are casually called "the backup", they contain different content, and they are retained differently. The environment backup, a daily capture broader in content than the maintenance snapshot. The maintenance snapshot, taken during daily maintenance and the artefact you typically work with. And the artifact snapshot, which you take on demand and which is the vehicle for migrations. The critical distinction: the environment backup contains artefacts the maintenance snapshot does not, and those are the ones that surprise people during a recovery. Closes with a decision table for four situations.