I did. It was an first-principles architectural decision. A client could request any point-in-time within the contracted period, and it could be either a restoration or a fully operational, parallel instance of the account.

It was initially a cover-my-own-ass design, but it turned out to be an extremely popular feature that was never even used for disaster recovery. Instead, it was used for audit support, trial scenarios, projections, and all kinds of other stuff.