03.08.09 System Backup – Cryptographic Protection
What the standard requires
a. Protect the confidentiality of backup information. b. Implement cryptographic mechanisms to prevent the unauthorized disclosure of CUI at backup storage locations.
Quoted verbatim from NIST SP 800-171 Rev 3, 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 03.08.09 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.