Freezer burn is caused by dehydration in improperly wrapped food. The colder it is, the slower that happens. Anything less than maybe 25 will freeze food but keeping it close to 0 will minimize burn. In case of a power outage, the colder it is, the longer it will keep. The difference between 0 and -3 is irrelevant.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.