1. A method for tracking documents stored on behalf of a plurality of tenants, comprising: receiving at a host system, an original document to store on behalf of a first tenant; storing a copy of the original document to a document management storage in a storage accessible to the host system; and tracking, at the host system, the original document and the copy of the original document in the document management storage by a unique identifier assigned to the original document and a corresponding unique identifier assigned to the copy of the original document stored in the document management storage; wherein the unique identifier assigned to the copy of the original document stored in the document management storage is tracked using a portion of a database resident at the host system limited to information of the first tenant; allowing a level of access to be granted to the document that allows a plurality of users of the first tenant to at least edit the document.