NIST 800-171 3.8.9 (MP.L2-3.8.9): Backup Confidentiality
Protect the confidentiality of backup CUI at storage locations.
CMMC Level 2 practice MP.L2-3.8.9
What 3.8.9 means in practice
Backups hold the same CUI as the live system, so they need the same protection wherever they are stored: encryption, access limited to authorized people, and physical security for any copies kept off site. Cloud backup services are storage locations too, so their encryption settings and access lists are part of the evidence.
SPRS points and the CMMC POA&M
- CMMC Level 2 practice
- MP.L2-3.8.9
- SPRS points
- 1 point. When it is not met, the DoD Assessment Methodology subtracts 1 from the score of 110.
- CMMC POA&M
- Allowed. It is worth 1 point, and 32 CFR 170.21(a)(2)(ii) admits requirements worth 1 point. Conditional status also needs a score of at least 88, and the item must be closed within 180 days.
Sources: NIST SP 800-171 DoD Assessment Methodology, version 1.2.1 (June 24, 2020), Annex A; 32 CFR 170.21, Plan of Action and Milestones requirements.
What an assessor checks for 3.8.9
NIST SP 800-171A gives one determination statement for 3.8.9.
Determine if the confidentiality of backup CUI is protected at storage locations.
NIST SP 800-171A (June 2018), assessment objectives for 3.8.9
Evidence that shows 3.8.9 is met
- Backup encryption settings and how the keys are managed.
- Access permissions on backup storage and vaults.
- Physical security records for backups stored off site.
How PolicyCortex gathers the evidence
PolicyCortex reads this evidence with the collectors below, read only, and grades 3.8.9 from it. Each line says what the product checks.
- Azure Backup: Recovery Services vaults. Reads Recovery Services vault configuration and checks that CUI backups are encrypted where they are stored.
Meet the requirement once. Keep the evidence current.
- Published
- Last updated
- Unchanged since publication