Thread:Project:Support desk/Back-up of deleted revisions

Hello. I'm posting here because I don't know where exactly I should be asking this so sorry if this is the innapropiate place. I'm looking for somebody who can tell me, or tell me where I do have to look to know if a WM project does back-up deleted revisions or not. I ask this because I'm planning a rewrite of the Meta-Wiki's deletion policy that states the project does not keep back-up of deleted revisions; and whish to know if this is still true. Thank you in advance.