Systems and methods are disclosed for accessing data over a distributed data storage network. A network-attached storage device (NAS) includes a non-volatile memory module comprising a first portion of data storage for storing local user data associated with a host computing device and a second shared portion of data storage for storing third-party data. The NAS includes a controller configured to provide copies of a portion of the user data to one or more other NAS's for storage therein, receive third-party data from each of the one or more other NAS's, and store the received third-party data in the second portion of data storage. The NAS is configured to upload at least a portion of the user data to the host computing device and upload at least a portion of the third-party data to at least one of the one or more other NAS.