To back up your data, from the main menu bar at the top of the VGS window choose the "File" menu, then select "Database" and then "Backup...".
From the dialog which then appears, choose the "Browse" button and select the location where you want the backup file to be placed. When using VGS on a tablet computer, we recommend the database be backed up to a thumb drive or other external storage so that the backup will be available even if the tablet is stolen or disappears into the depths of the creek you were trying to cross. The default file name will be "VGS_" followed by a date and time stamp. However, you may change the name of the file as desired by editing the name in the listed path.
In the case of a typical tablet installation of VGS, the backup file is simply a complete copy of the database file.