6. A computer-program product tangibly embodied in a non-transitory machine-readable storage medium, including instructions that, when executed by the one or more processors, cause the one or more processors to: receive a request for a snapshot of a document at a previous point in time; identify events associated with the document prior to the previous point in time, wherein the events include every event associated with a change in the document prior to the previous point in time, wherein an event of the events includes a deletion of at least a portion of the document, wherein each event of the events is separately stored in an archive, wherein the archive receives a first set of one or more events from a first communication modality and a second set of one or more events from a second communication modality, and wherein the archive processes each of the first set of one or more events and each of the second set of one or more events to a common format; and generate the snapshot by performing each event of the events, wherein the snapshot represents the document at the previous point in time.
6. A computer-program product tangibly embodied in a non-transitory machine-readable storage medium, including instructions that, when executed by the one or more processors, cause the one or more processors to: receive a request for a snapshot of a document at a previous point in time; identify events associated with the document prior to the previous point in time, wherein the events include every event associated with a change in the document prior to the previous point in time, wherein an event of the events includes a deletion of at least a portion of the document, wherein each event of the events is separately stored in an archive, wherein the archive receives a first set of one or more events from a first communication modality and a second set of one or more events from a second communication modality, and wherein the archive processes each of the first set of one or more events and each of the second set of one or more events to a common format; and generate the snapshot by performing each event of the events, wherein the snapshot represents the document at the previous point in time. 7. The computer-program product of claim 6 , wherein a change in the document includes an addition, a deletion, or a combination thereof.