When working on a disaster recovery or business continuity plan, two essential points that must be agreed upon by all parties are the recovery time and recovery point objectives (RTO and RPO). Without these, it is impossible to correctly size your backup systems or recovery procedures.
Do you need clustered systems or off-site failover? How frequently should backups be performed? What about SQL transaction logs?
These questions can only be answered once you have an agreed upon RTO and RPO with the business units. So what exactly are they?