A freezer alarm can warn locally or send a remote notification, but each depends on a different chain of devices and power. Map what your alarm can report before relying on it.
Appliance Maintenance guides
Practical household guidance about appliance maintenance.
Find out whether your freezer is meant to be defrosted by hand, then use its own manual for the power, food-transfer, drainage, and restart steps.
The difference between manual defrost and frost-free is mostly about owner upkeep. Decide how often you want to plan a defrost, then compare model-specific energy and maintenance instructions.