1. A system, comprising: a first data storage service comprising a plurality of data storage devices and a first web service interface configured to receive web service requests transmitted to the first web service interface, the first data storage service being configured to process the web service requests transmitted to the first web service interface using the plurality of data storage devices; a second data storage service comprising a second web service interface, the second data storage service configured to operate as a proxy to the first data storage service by at least: receiving data in connection with a request, submitted to the second web service interface from a requestor, to store data; analyzing the received data to generate a determination whether the received data satisfies one or more criteria of one or more data loss prevention policies; processing the received request in accordance with the generated determination, wherein: when the determination indicates that the received data satisfies the one or more criteria of the one or more data loss prevention policies, processing the received request includes: using a key maintained inaccessible to the first data storage service to encrypt the received data; and transmitting the encrypted received data to the second data storage service by submitting a second request to the first web service interface.