Task: In order to have a backup, export all of the reminders in the Google Drive app in file format.
Steps:
Click on the menu icon at the top left corner of the screen
Click on the Backup/Restore option
Click on the Take Backup button
Click on the Take Backup button
Click on the OK button
Click on the three dots of the ToDoBackup_81.db
Click on the share option
Click on the Drive option
Click on the dropdown icon of the account 
Click on the Jane email id
Click on the Save button