Hypothetical Disaster Recovery question

We have on-premise set up with two servers: (1) Application/Document Server and (2) Database Server.

In a hypothetical scenario: We lose Server #1 and have to rebuild and restore from a backup, but the next good backup is a week old. My question would be, what would I need to be concerned with or do to resynch my #1 - Application/Document server (week old data) with my #2 - Database Server (current data)?

Thank you!