Identify what the backup actually contains
Begin with the information in the source systems, the contract requirements, and the backup configuration. A backup of CUI can contain the same controlled information as the production copy; moving it into a different storage format does not erase its handling requirements. Conversely, do not classify every business backup as CUI solely because the company works with DoD. Use the relevant information categories and contract instructions, and obtain clarification where needed. Record which systems, directories, application data, and historical copies are included, because a marketing description of the backup service rarely identifies those details.
Apply the relevant confidentiality requirement
NIST SP 800-171 Revision 2 requirement 3.8.9 addresses protecting the confidentiality of backup CUI at storage locations. Review it alongside other applicable requirements for access, media protection, and cryptographic protection. The implementation should reflect the real storage arrangement and the requirement being addressed. This article does not create a universal rule that every contractor must use a particular backup vendor, topology, or retention period. Separate confidentiality safeguards from business recovery objectives, then identify how the chosen design meets both. A successful backup job proves little about who can access the resulting copy.
Include storage and administrative dependencies in scope
Identify local appliances, offsite media, cloud destinations, management consoles, encryption key administration, and service personnel involved in the backup process. Evaluate those assets and services using 32 CFR 170.19 rather than assuming backups sit outside the assessment because they are rarely opened. A cloud service processing, storing, or transmitting CUI brings specific requirements under the relevant CMMC and DFARS provisions. Verify the particular offering and configuration. A provider brand name, a broad security page, or encryption enabled in one part of a product does not establish all necessary conditions for the deployed arrangement.
Plan restores without creating an uncontrolled copy
Decide who may request a restore, who approves access, and which destination is authorized to receive the information. A test restore into a general-purpose laptop or unrestricted file share can undermine the intended boundary. Use a suitable controlled process and appropriate test data where possible, and protect any actual CUI involved. Record whether the restore procedure relies on a separate provider identity or temporary access path. Recovery testing is useful operational practice, but avoid presenting an arbitrary test frequency as a requirement of 3.8.9. Establish the schedule through the applicable obligations and organizational recovery needs.
Review retention, transport, and disposal together
Document why copies are retained, how authorized people locate them, and what happens at the end of the approved period. Consider legal, contractual, and records obligations before deleting data. For media that moves between locations, review the applicable accountability, transport, and confidentiality requirements. For disposal or reuse, requirement 3.8.3 addresses sanitizing or destroying media containing CUI. Clarify what deletion means in the chosen service and what the provider can substantiate. Do not promise immediate erasure of every historical replica without understanding the service behavior, its contractual terms, and the authorized retention requirements of the organization.
Keep evidence tied to the deployed process
Useful records may include the backup scope, authorized administrators, relevant settings, provider responsibilities, restoration approvals, and appropriate operational outputs. Explain what each artifact shows and what it does not. A configuration screenshot from a different tenant or an outdated product version may be misleading. Link backup dependencies to the inventory, diagram, and SSP, then revisit them when storage or services change. A readiness platform can organize these relationships, while the technical and contracting teams validate the safeguards and obligations. The end result should be an explainable backup process with protected information accounted for throughout its life cycle.