rsync-over-ssh-over-serial.
~/code/ugetty$ rsync -anv root@ttyACM0:/media/mmcblk0p1/boot .receiving incremental file list
boot/
boot/System.map-6.12.67-0-rpi
boot/config-6.12.67-0-rpi
boot/initramfs-rpi
boot/modloop-rpi
boot/vmlinuz-rpi
sent 43 bytes received 200 bytes 486.00 bytes/sec
total size is 52,403,630 speedup is 215,652.80 (DRY RUN)