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Are you on a windows PC?
You could open a command window and use
xcopy *.* e:\SDCARDPATH /d
But, that might be a bit slow because I still think it has to compare the file dates on all the files.. but it will only copy those files with newer dates.
You could also use:
xcopy *.* e:\SDCARDPATH /M
this reads the Archive attribute. This is a built in file attribute that is designed for backup software. When you create a new file it is set on. When you copy the file with the command above it is set off. The command only copies files with the attribute and it removes the attribute after it copies. Also, if you modify a file the attribute is set again.
How big is your library? You might want to use dropbox which will back up your files to the "cloud" automatically. It is free for up to 2GB and happens on the fly.
If you want to get a dropbox account let me know... I will send you an invite which will give me some free extra space.
Baring the above you could use a real backup program. Something like Crash Plan which is free (if you don't pay for the online storage).
BOb
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