Answer
A complete IBM i backup scope usually includes more than application libraries. Buyers should confirm coverage for the Integrated File System, user profiles, authorization lists, configuration objects, job scheduler definitions, spool and output dependencies where relevant, and any encryption keys or scripts required to restore the environment cleanly.
The real mistake is assuming production data alone equals recoverability. If security objects, configuration, or external file structures are missing, a restore may technically succeed while the business remains offline.