I doubt that the magnet on the clasp is strong enough to mess with the equipment. The internal storage isn't magnetic media like floppies or cassette tapes and as so won't be affected by a magnetic field.
Your hard drive on your PC contains magnets much, much, stronger than anything you'll ever commonly see and they don't affect the data on the disk itself. An SD card would probably survive degaussing where a floppy / hdd / tape would not.
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