I have attached log file of operation. It actually ends at [22-Oct-2017 03:09:44] Uploading to Dropbox.. No message about running out of space if making full backup.
However, when running db backup, there’s obscure error:
[24-Oct-2017 02:11:14] 1. Try to send backup file to Dropbox …
[24-Oct-2017 02:11:14] Authenticated with Dropbox of user: James Smith
[24-Oct-2017 02:11:14] Uploading to Dropbox …
[24-Oct-2017 02:11:16] WARNING:
[24-Oct-2017 02:11:16] ERROR: Uploaded file size and local file size don't match.