Just did a speed test. 2.64GB file, 4 channels of 24/48 for 57 minutes.
Took a bit less than 6 minutes to transfer to USB stick.
Takes me longer to break everything down, so ought to be just fine.
I had connected a USB stick to format it for mp6. On powerup, the record light flashed; I pressed it and it transferred the last recording, made 12/5, to the stick.
Why not just shut down as usual, then backup to USB later? For folks that don't like the wait, wouldn't this be a solve?