Are you sure you want that, and for what situations?
Duplicati Backup and Backing up Duplicati is one experienced person’s take on what to save and what not.
Database page can Repair loss of database if system is destroyed. Direct restore from backup files exists.
These will usually also be far faster, although in a damaged remote backup situation they can be very slow.
You should definitely save an Export of the job configuration somewhere safe. That’s tiny. DB might not be.
If you have to save it, one question is how many copies to save, e.g. to protect against damaged database. Also note that it’s not encrypted (even if your backup is), but the main harm is that it may reveal file names.
If you absolutely have to save a copy to Google Drive, and you have a part of Google Drive set to sync from local disk, you can probably just make a batch file with a copy command, and run that with run-script-after. Sync will take awhile for a large database, and I suspect for awhile you’ll have only part of a database there.
If you have to save an encrypted copy, rclone can do it from the script. Some people may put a second job in Duplicati to backup the database from the main job after it finishes, but then how to backup second DB?