For this reason you should always back up your tree file before you make any major changes like syncing, merging, updating your copy of Family Tree Maker ®, and so on. An up-to-date full backup ensures that you will be able to immediately restore your tree - including media and the link to your online tree if you have one - should something unexpectedly go wrong with your current file. Making a full manual backup of your tree file is something that you should do often.
