Hi Richard-
If you’re using the most recent version of Total Upkeep, you’ll find logs for your Google Drive uploads in Total Upkeep > Tools > Logs.
Look for the log files google-drive-connect.log and google-drive-upload.log. If you can reply with the information from there, we’ll be able to tell what went wrong with your uploads.
As far a security goes, there are a lot of different options out there. Probably the most popular is WordFence among many others. In general, the best thing you can do for security is to make sure your plugins and WordPress Core version are up-to-date, and to make sure you’re using reputable plugins.