I did it while trying to wirelessly synchronize with Omnisky and I ended up losing all of my data by doing a hard reser (starts your Visor over from scratch).
The first time, it was quite a blow because I had to reinstall everything. The next day I ordered this product and when it arrived I immediately made a backup.
I am thinking about getting two of these items, one for a baseline backup of my system and one for my everyday backup of essential information.
It is quick and easy, when you insert it into the slot the Visor loads the program and prompts you for action. You simply click on the icon that identifies backup or restore and it does the rest. When it is done you can remove the module and everything is back to normal.
I have found that over time, i have become more and more dependent on my visor. (Besides other things, it really helps me keep track of finances and has rid my computer screen of yellow sticky notes).
If you have data on your palm that you would rather not loose, you'll love this module from the get go. One click, 10 seconds and you are done backing up(ok, a bit longer if you have a lot of data on it). Restoring takes, hold your breath, one click and 10 seconds. It really is that easy. This is one of those add-ons that makes the visor so much better than the palm m100.
(The price) might seem steep at first for an add-on, especially since the visor itself is under $100 now. Still, over time, you'll swear by this little wonder. Now if only i could get something like this for my computer running that nightmare of an os, windows.