Bullitt, as usual, covers the facts well. I have one thing to add.
Buy the external drive* and quit worrying. BUT, buy two, and then use one to back up the other on a regular basis. You can have one connected to the system all the time as the new overflow reservoir of digital data, and then on backup day, you haul out its twin and do a backup. Put the backup twin away, in a different location, until next time.
Keep taking pictures. Rinse, repeat.
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Be Just and Fear Not.
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