AWS-Disaster Recovery

Disaster recovery (DR) is an organization’s ability to restore access and functionality to IT infrastructure after a disaster event, whether natural or caused by human action (or error). Today, disaster recovery planning is crucial for any business, especially those operating either partially or entirely in the cloud.

Any event that has a negative impact on a company’s business continuity or finances is a disaster. Disaster recovery(DR) is about preparing for and recovering from a disaster.

What kind of disaster recovery ?

On-premise => On-premise: traditional DR, and very expensive
On-premise => AWS Cloud: hybrid recovery
AWS Cloud Region A => AWS Cloud Region B

Need to define two term

RPO: Recovery Point Objective
RTO: Recovery Time Objective

Disaster Recovery Stategies

Backup and Restore
Pilot Light
Warm Standby
Hot Site / Multi Site Approach

1. Backup and Restore

Backup and restore can take a lot of time and so you get a high RTO as well. But

It is quite cheap to do backup and restore.
We don’t manage infrastructure in the middle.
We just recreate infrastructure when we need it,
We only have cost of storing these backups.

2. Pilot Light

A small version of the app is always running in the cloud.
Userful for the critical core (pilot light).
Very similar to Backup and Restore but faster than because critical systems are already up.