Bandwidth keeps recordings for 30 days. Be sure to fetch and save any recordings you want to keep before the 30 days are up.
To list recordings, use this API: http://dev.bandwidth.com/ap-docs/methods/recordings/getRecordings.html
To retrieve recordings, use this API: http://dev.bandwidth.com/ap-docs/methods/media/getMediaMediaName.html
To delete a recording (or any media file), use this API: http://dev.bandwidth.com/ap-docs/methods/media/deleteMediaMediaName.html