As others have mentioned, this is not uncommon at all, it's called software escrow. For clients that need/want/demand this you can pass the cost onto them. On

As others have mentioned, this is not uncommon at all, it's called software escrow. For clients that need/want/demand this you can pass the cost onto them. On your side, you do the work once in your build/CI to upload/FTP source and artifacts to the escrow agent and you're done.