Your customer wishes to deploy an enterprise application on AWS, consisting of several web servers, several application servers, and a small (50GB) Oracle database. The information is stored both in the database and the file systems of the various servers. The backup system must support database recovery, whole server, and whole disk restores, and individual file restores with a recovery time of no more than two hours. They have chosen to use RDS Oracle as the database.

Answer options:

A.Backup RDS using automated daily DB backups. Backup the EC2 instances using AMIs and supplement with file-level backup to S3 using traditional enterprise backup software to provide file-level restore.
B.Backup RDS using a Multi-AZ Deployment. Backup the EC2 instances using AMIs and supplement by copying file system data to S3 to provide file-level restore.
C.Backup RDS using automated daily DB backups. Backup the EC2 instances using EBS snapshots and supplement with file-level backups to Amazon Glacier using traditional enterprise backup software to provide file-level restore.
D.Backup the EC2 instances using AMIs and supplement with EBS snapshots for individual volume restore.

Answer - A
Option A is CORRECT because (a) it uses automated daily backups from which the recovery can be made quickly, (b) the file-level backup to S3 will ensure that the recovery can be made at the individual file level - which satisfies the requirements.
Option B is incorrect because Multi-AZ deployment is for Disaster Recovery, not for data backup.
Option C is incorrect because Glacier is an archival solution and most certainly will not meet the criteria of RTO of 2 hours.
Option D is INCORRECT because just backing up the EC2 instances alone would not suffice. Here the RDS database would also need to be backed up to S3.
For more information on this topic, please visit the links below.
https://aws.amazon.com/rds/details/backup/
https://d0.awsstatic.com/whitepapers/Backup_and_Recovery_Approaches_Using_AWS.pdf
https://blogs.oracle.com/pshuff/amazon-rds