The upload task just copies the Tasker backup file to Google Drive. If you haven't made a local backup of Tasker before, hit the 3 dot menu in Tasker. Then goto Data>Backup and then hit the arrow at the top left of the screen. It should default to the correct location for the Upload task to find it.
You could make a profile to run on a timed event and just download the file every so often. You could set the profile to run every hour or whatever interval you want.