This is a bit too details as a first paragraph. It's helpful to explain briefly why a user would want to read this document, and what's in it. E.g.:

"Riak is built to survive the loss of nodes due to network or hardware failure, but you cannot account for every contingency, such as accidental or malicious deletions. This is why many Riak users choose to backup their data, which duplicates your database onto a different longterm storage mechanism. This document covers how to perform backups in Riak."