An alternative might be to provide a feature that would tell calibre send a shut down/sleep message to the OS when its batch jobs are done, before it terminates itself. A 'do once' button in the Alt_Shift+J Jobs would do the trick. That way any non calibre tasks scheduled to run on logoff, sleep (?), or shutdown -- like backup -- get done.
I prefer solutions that put the onus on the user to do something "now", rather than relying on (or getting bitten by) some previously set and long forgotten option.
BR
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