To transfer your Family Tree Builder Tree from one computer to another:
First, save your family tree from Family Tree Builder onto removable media. The best way to back up your family tree is to use Family Tree Builder’s backup facility on File > Back up Project. It will save a single file, perfect for backup, that contains your family tree and all its photos and documents. You can save it to any removable media device such as a flash/pen drive or CD/DVD.
The backup can then be restored on Family Tree Builder on a different computer, by going into Family Tree Builder on that computer and using File > Restore Project.