my rsync backup use case over usb and adb (with adb root)

start rsync daemon: adb root adb forward tcp:6010 tcp:11873 adb shell "rsync --daemon --port 11873 --config=/sdcard/rsyncd.conf &"

rsync: rsync -rltHDhP --stats --size-only --append-verify --partial --delete rsync://localhost:6010/root/data/data/ /backup/data

cleanup: adb kill-server

/sdcard/rsyncd.conf for the phone: address = 127.0.0.1 uid = root gid = root [root] path = / read only = true