@rustybin
The kit by Garman_Nuvi using cmd "copy,0:/Garmin/garmindevice.xml,1:/Garmin/Updater/1350/garmindevice.xml" will dump a copy of the XML in the 1350 folder. A briefer cmd such as "copy,0:/Garmin/garmindevice.xml,1:/garmindevice.xml" will dump it into the card's root. Keeping the path short minimises any chance of typographical error in compilation as well as a read/write error of execution.

"copydir,0:/,1:/BackUp/" is indeed the correct txt cmd to dump the entire visible file system into a Backup root folder on the card.

Provided you have the correct folder layout on your card (Garmin\Updater\1350) with the appropriate update.txt file and Ldr.bin file in the 1350 folder, your cmd of "copydir,0:/,1:/Backup/" should have worked.

If you reused the card without cleaning it first, i.e. you simply changed the text in updater.txt, you must remove an existing BIN file named "last_id.bin" or the device will ignore the command/s. The is no problem in leaving "update.log" in place however and some devices (but not nuvi 50) even require the file to be present for the flash to work.