Backup icon by ByLUTFI GANI AL ACHMAD You can find articles everywhere that computer users might read, urging us all to back up our trees, our files, our DNA matches, etc.  One of our members recently brought this up in our Genealogy Chat after discussing the future of the genealogy DNA industry, which is slowing, thus making  less money for  the companies offering these services.   Back Up Your Tree If they did not back them up, Ancestry.com Y and mtDNA testers lost access to their test results and matches  as of September 30, 2014 . So there are examples of this happening before.  All of the genealogy tree-building sites offer a way to back up your bare-bones tree via a GEDCOM, which is a simple text file. If you also want to download your images and other records, you will need instead to"sync" your files using a desktop genealogy application which uploads to and downloads from the online trees. Your DNA Guide has an article comparing what is offered to sync with Ancestry,