The nice thing, is using the sync mode of #Rclone means the initial upload took ages but successive backups only do the changed files so it's pretty quick.
Also had to debug ways to ease back the rate limiting from #Dropbox, luckily there was some good info about this in the Rclone discussion forums.
It cracks me up that Rclone refuses to sync Thumbs.db files. It spits an error when it encounters them. Even file copy utilities hate these! 🤣 This was an effective way to find and purge these.