AWS Certified Solutions Architect Associate Test 1

In Amazon Web Services, Amazon EBS volumes that operate with 20 GB or less of modified data since their most recent snapshot can expect an annual failure rate (AFR) between 0.1% and 0.5%.
For this reason, to maximize both durability and availability of their Amazon EBS data, the user should frequently create snapshots of the Amazon EBS volumes.Reference: http://media.amazonwebservices.com/AWS_Storage_Options.pdf