Before starting with a database in earnest, experiment with the app to see what it can do. Start with one profile and one testing company.
Follow these steps:
When comfortable with all of these steps then it is time to extend the database to multiple profiles and multiple testing company downloads.
Backup is Your Friend
After starting a permanent database, you can continue to experiment by using the File functions to back up your database.
Garbage in, garbage out is a common expression in the computer industry. Since GDAT is dependant on data from other sources, the GDAT database should be backed up before every data import so if there is an issue, prior work can be recovered quickly.
It is also good practice to backup periodically. Backup and Restore are fast but recreating a database is not.

GDAT (Genealogical DNA Analysis Tool) is a DNAGedcom tool. © DNAGedcom LLC 2020–2026. Genealogical DNA Analysis Tool is provided as is with no guarantee given as to its performance.