At this time, ForeFlight does not support direct importation of .IBK or .BAK files from NC Logbook Pro. Instead, it is recommended to export the NC Logbook Pro file as a .CSV file, which can be imported into ForeFlight Logbook. See this article that describes the importation process:
How can a digital logbook be imported into a ForeFlight account?
For best results, consider transferring your logbook data into the appropriate fields of the ForeFlight Logbook template and then upload the template. For more detailed instructions, refer to this article:
How can a logbook in a spreadsheet be transferred into the ForeFlight Logbook template?
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