CP-9(3) System backup | separate storage for critical information
What the standard requires
Store backup copies of [critical system software and other security-related information] in a separate facility or in a fire rated container that is not collocated with the operational system.
Quoted verbatim from NIST SP 800-53 Rev 5 (OSCAL catalog), which is in the public domain.
Cross-framework mappings
No cross-framework mapping is seeded for this control. That is stated rather than filled in: a mapping nobody authored is worse than a gap you can see.
Track CP-9(3) with evidence behind it
In CMDash this control is a row with an owner, a status, uploaded evidence kept with its full history, and an export an assessor can read.