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 do I import my digital logbook into my 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 do I transfer my logbook, which is in a spreadsheet, into the ForeFlight logbook template?
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