PureCloud utilizes the following Amazon technologies for storing all data: Amazon S3 Standard, Amazon S3 -IA and Glacier. The following additional details and links provide additional details on these data storage and backup technologies.
Amazon S3 Standard and Standard - IA: are designed to provide 99.999999999% durability of objects over a given year. This durability level corresponds to an average annual expected loss of 0.000000001% of objects. For example, if you store 10,000 objects with Amazon S3, you can on average expect to incur a loss of a single object once every 10,000,000 years. In addition, Amazon S3 is designed to sustain the concurrent loss of data in two facilities.
Amazon S3 Standard and Standard - IA: redundantly stores your objects on multiple devices across multiple facilities in an Amazon S3 Region. The service is designed to sustain concurrent device failures by quickly detecting and repairing any lost redundancy. When processing a request to store data, the service will redundantly store your object across multiple facilities before returning SUCCESS. Amazon S3 also regularly verifies the integrity of your data using checksums.
Amazon Glacier: Is used for archival storage providing lower cost storage for data that is infrequently accessed and for which retrieval times of several hours are acceptable.
https://aws.amazon.com/s3/faqs/
https://blog.cloudsecurityalliance.org/2010/05/24/amazon-aws-11-9s-of-reliability/