Hi !
First of all, I know it's possible .. BUT :

Here's what I did :
Scanned 88 DVDs on my iPhone
Synced with PC#1 (at work)
Then opened DVD Profiler on PC#2
Tried to "update" on this second PC

Expected result : That should have copied the whole collection on that second PC
What I got : Whole collection was erased from my iPhone without even a "are you sure?" warning