LG N1T1DD1 Owner's Manual page 70

. File back-up service
10
-2
On second back-up, (January 2nd 2009), a.txt and b.txt are deleted, d.txt and e.txt
are added. At this time, USB contains files as follows.
ex 2)
A folder with the date of back-up is created and only added or changed
files are saved there on second back-up as well. As in above case, only
added d.txt and e.txt are saved. And last backup is filled with files that are
currently present in USB.
In a folder of a lower level
a.txt/b.txt/c.txt created
In a folder of a lower level
d.txt/e.txt/ created
In a folder of a lower level
c.txt/d.txt/e.txt created
70
USB back-up set-up