Not sure how exactly are you archiving / mirroring your database, but I did use wall-e in the past with great success.
We actually had to recover the state of database at given point in time to investigate the incident that happened. Postgres has this Wrire-Ahead-Log that basically is a log of all events that happen in database. This tool allows you to archive that, and do point-in-time recovery if needed. So you can say restore to database state as of 11:00 GMT, and then 11:01 GMT etc. Highly recommended: