Answer
Usually yes. IBM i is stable, but the recovery path can still be compromised through shared credentials, connected backup infrastructure, or surrounding Windows and network systems that attackers reach first. An isolated, immutable, or offline copy gives the business one recovery layer that is harder to alter under attack.
Buyers should ask exactly how that protection works in practice. A vendor claim about ransomware readiness is weak unless the copy cannot be changed easily, the restore path is documented, and the team has tested it.