It is recommended that you frequently backup your data to deal with unfortunate events such as broken or stolen handhelds or when changing devices. Backing up is easy. On the home page, open the menu by pressing the 'menu' button on the top right and select "Backup Data" This will create a new backup folder named "AviMan" in the root directory of your SD Card or phone storage. If the backup folder already exists it will be updated. Copy this folder to your PC for safekeeping.
In order to restore saved data, copy the backed up "AviMan" folder to the root folder of your SD card and select "Restore Data from SD" Your data in the backup will be restored.
If you are using Android 6.0 (Marshmallow) or above and facing problems in backing up the database please check that you have allowed the necessary permissions. Go to Settings > Apps > Aviman > Permissions and make sure that the Storage permission is turned On.