Replay Times
Tell me if I am wrong, but I guess you mean "reply" instead of "replay"?
Apart from that, thanks for the hard work and the updates!
The backup PDF seems to be a good idea.
To further increase safety I wonder if in future a 2 FA solution could be possible?
No, it's "replay time", meaning the time to run (replay) the entire history of the blockchain. Replaying the history is necessary to do when storing all the blockchain data into a new format such as RocksDB.
Thanks for explaining!