1. Create a brain in your ~/Dropbox folder on your Desktop. If you already have a brain you want to sync, drag that .brain file and _brain folder into aforementioned dropbox folder. Change your pointers in PB to the new location.
2. Open PB and edit, change, add, whatever. 3. Close PB. Look at the dropbox icon in the menubar. When the icon has changed from a box with blue circle arrows to green with a checkbox, it's synced. You may now shut down your mac, or leave open. If you leave your desktop running, do not shut down dropbox. Note - Closing the dropbox folder is not shutting it down. Quitting the dropbox application is shutting it down. 4. Fire up the laptop. Check the Dropbox icon to make sure the green circle is there, if not it's syncin, wait until the green arrow is there. Fire up PB, point it to your dropbox location and the brain you have there. You are good to go. Rinse and repeat steps 2-4 when you go between the different 'puters. 5. Make Brainzips often. Daily. If you use Time Machine, you can relax a bit more. If you do use Time Machine and need to restore, never do a partial restore. Always restore the whole _brainzip folder and the .brainzip file.
Java SE 6