maybe on xda it is common sense, but for me it was necessary to know, that these stock android recovery extracted files can be restored with nandroid custom recovery, if you simply repack them into tar archive.
i put this two command lines in a dirty shell script (extract + repack as tar).
thanks to ektoric figuring out his gunzip method!
edit: notamamasboy's mount method added (but not tested yet). if script not works come back few days later, download again and check version, maybe it has changed meanwhile.
with this you're able to transfer data of non-rooted phone to (rooted) similar one.
this is useful in case touchscreen is broken, you haven't custom recovery installed, usb-debugging is disabled and connecting usb-otg-mouse doesn't work.
tested on my Archos 50 b Oxygen (Mediatek MT6582).
it works for me, feel free to improve, port to busybox and publish. no support. use at own risk.
edit: bckp2cwm.sh is deprecated it is FOR JELLY BEAN ONLY (no selinux support)
a newer (selinux) version bckp2win.sh for TWRP you can find here: