I have done the backup and extracted the "USA_and_Canada.zip" file (by default, it created a folder within the TomTom root folder on my computer's hard drive). When I tried to copy this file onto the unit, it returned an error message saying there is not enough free space. The unit (a TomTom ONE 130) has only 979.1 MB total capacity, and only 559.5MB are currently available (I deleted the original "USA_and_Canada" folder to create space). The expanded file is 828.4 MB.
There was no warning that this was an oversize file when I purchased and downloaded it from TomTom. Is it supposed to be overwriting some files? How do I create more free space?