Can anyone tell me what this means?
I believe this issue was fixed via [minor][fix] path fixes for manual dropbox backup by saurabh6790 · Pull Request #2234 · frappe/frappe · GitHub.
What version are you on? Can you update and see if this issue comes up again.
I get the same error.
I’m on ERPNext 7.1.23 and Frappe 7.1.24, which were released after the above fix was merged.