Backing up all data on NUVI 750?

Has anyone tried backing up ALL the data on their NUVI to a computer
and then restoring?

The NUVI shows as just another drive when connected to the computer,
so if one copied all the folders and files to the computer, would it
then be possible to restore all one's personal settings, maps, images,
POIs etc.?

Foe example, it would be all too easy for an inexperienced family
member, for example, to do a RESTORE when in the SETTINGS menu, which
I understand would wipe out all one's personal stuff.

I daren't test this myself, but maybe someone has done it?

I have done this when I was having trouble getting the CN2009 maps installed
on my Nuvi 760. I used my backup to know where things should be for the
rebuild. I have never seen a slower device than the Nuvi's. I can move the
CN2009 in two minutes on SD card. About an hour for the nuvi. Garmin has
USB chipset problems. I feel like a beta tester for Garmin instead of a
customer.

Slow USB connections have always been that way with Garmin units. When I
got my Streatpilot 2610, it was also slow and it was much faster to just
take out the compact Flash Card and plug it into a Compact flash
reader/writer instead. So this is nothing new. I do the same now and pop
out the SD card and plug that directly into my PC as it's faster. I think
Garmin is just using USB 1.1 and not 2.0 which is a hell of a lot faster.
Maybe they're trying to save a few cents sticking with 1.1?