( RTO) This means the acceptable delay between the incident and the return to a normal production.
It is thus essential to define the highly available systems which guarantee the delay for return in production expected by the company.
( RPO) This indicates the number of days, hours and minutes of production data which the business is ready to give up further to an incident.
The technologies implemented in the framework of backup and archiving lead to define an RPO not so similar from the version of data production at the time of the incident. Following the need expressed by the restoration, the set of replication technologies until archiving allow to make available a set of versions of data to restore.
It is thus essential to define highly available systems which guarantee RPO expected by the company.Time between the component failure and its replacement to ensure redundancy. A second failure similar the second one during this period thus leads to a service interruption which can be longer than the previous one if restoration then becomes impossible.
Planned Downtime : time to be planned so as to proceed to full restoration following failure or a disaster.
Business Continuity of a company are defined according to RTO and RPO. An availability strategy of an information service should be defined according to the following 4 time segments:
