Classify the data
Separate databases, business files, configuration and logs. Identify how often each changes and how important it is to the service. Use business requirements to set backup frequency, retention periods and recovery objectives.
Document copies and access
Record storage locations, permitted accounts and encryption methods. Plan independent copies for important data, and confirm capacity, transfer usage and version retention so resource constraints do not silently undermine backup jobs.
Test restoration
Creating a backup file does not demonstrate a working recovery process. Test file access, database restoration and application startup in a suitable environment. Record timings and procedures, then update the plan as the business changes.