how do I back up dropbox?

All the "Tessie" ones are from my daughter's wedding, so I hope not have to discard them.   It also says "waiting to sync" next to most of these Tessie.." listings, but at the bottom, it says "upgrade", which I do not want to do. 

I also get this message when trying to do the Back up steps

Since you appear to be out of quota, and your backup is on, the best option would be to delete the computer backup, as you don't wish to upgrade.

Have you tried clicking the delete backup button, which will move the folders back to their old location away from the Dropbox folder?

Sat.  My home screen is still wiped clean and I cannot reverse the backup. How can I do this?

Sorry, could you clarify what you mean? What happens exactly when you choose to delete the backup?