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This is a good add-on. However, I am having a problem.
I have it set to back up on exit, but since about April, I have been getting "_MSG_dialog.title" and when I press OK, the backup is not created.

Deleting the add-on and re-inserting it again does not improve the situation. Please let me know how to improve this issue.

Questa recensione riguarda una versione precedente (14.0.2) del componente aggiuntivo. 

Thanks for the review, sorry for the issue.
This is something already being patched. It should only be necessary to do the following :
On the backup options tab make sure the Use modal window is set. The non-modal option is no longer compatible.
This has solved the issue for other users. If it does not, please post to the github issue :
https://github.com/thunderbird/import-export-tools-ng/issues/559

Christopher