I am unable to run a Backup, the process will not complete and sticks with the green line about a third way through even after 12 hours!
Running Thunderbird 60.9.0, on Windows 10, everything work fine except that when I close down, Thunderbird says it wants to run a Backup, I accept and Backup starts, but never finishes. The 'green progress' line stops at about one third across and just stops even after letting it run for 12 hours!
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TB doesn't prompt for backups unless you have an add-on that does. Can you list your add-ons (Extensions) here?
To do a manual backup, Help/Troubleshooting Information, click Open Folder to open the profile folder in File Explorer, close TB, go up 3 levels until you're in the ...\AppData\Roaming folder, and copy the Thunderbird folder, or the Thunderbird folder added to a zip archive, to a backup location.
The extensions I have are 'gContactSync', 'ImportExportTools' and 'Lightning'. The backup is part of 'ImportExportTools', it has been working but then suddenly about a week ago it has stopped and I cannot find any way to get it working again.
To ask the obvious: does the size of the current backup exceed the space available in the backup location? Note that if you update to TB 68, there is a compatible version of ImportExportTools:
https://addons.thunderbird.net/en-US/thunderbird/addon/importexporttools-ng/
It backed up OK to a USB Fladh Drive, but will not work with a 2TB Home Cloud server with over 600 GB of spare capacity!! At least it proved that the software works - thank you for your help.