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OPF files are normally updated any time you press the OK button on the Edit Metadata dialogs, so you should not normally need to run the option to get them backed up.
That is intended primarily for use on old libraries that pre-date the existence of the OPF files in a Calibre library, and IS deliberately designed to run at a limited pace so that the function could be run as a background job without severely affecting performance of Calibre in the foreground.
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