Allow a means to archive chats & files offline.
For using teams in a consulting company, we'd like to offer a team area for specific customers. When the project is done, we'd need to archive all conversations (a straight time-stamped text record would suffice), and all related files that were ever uploaded (a giant ZIP would suffice, with folders-names time-stamped). Then, we'd delete the channel. No need to ever re-instate the channel or files.