I’ve found this – https://www.dropbox.com/help/89/en, but it apparently only works with DropBox for Business.
For normal DropBox, what I’ve done is (on Mac OS X) :
- Quit DropBox App
- move /Users/KD/DropBox to /A/Sync
- ln -s /A/Sync /Users/KD/DropBox
- Start DropBox App
So far seems to work fine.