An organization is setting up a backup and restore system in AWS of their in premise system.
The organization needs High Availability(HA) and Disaster Recovery(DR) but is okay to have a
longer recovery time to save costs. Which of the below mentioned setup options helps achieve
the objective of cost saving as well as DR in the most effective way?

A.
Setup pre- configured servers and create AMIs.. Use EIP and Route 53 to quickly switch over to
AWS from in premise.

B.
Setup the backup data on S3 and transfer data to S3 regularly using the storage gateway.

C.
Setup a small instance with AutoScaling; in case of DR start diverting all the load to AWS from on
premise.

D.
Replicate on premise DB to EC2 at regular intervals and setup a scenario similar to the pilot light.

Explanation:
AWS has many solutions for Disaster Recovery(DR) and High Availability(HA). When the
organization wants to have HA and DR but are okay to have a longer recovery time they should
select the option backup and restore with S3. The data can be sent to S3 using either Direct
Connect, Storage Gateway or over the internet.
The EC2 instance will pick the data from the S3 bucket when started and setup the environment.
This process takes longer but is very cost effective due to the low pricing of S3. In all the other
options, the EC2 instance might be running or there will be AMI storage costs. Thus, it will be a
costlier option. In this scenario the organization should plan appropriate tools to take a backup,
plan the retention policy for data and setup security of the data.
http://d36cz9buwru1tt.cloudfront.net/AWS_Disaster_Recovery.pdf