Two DS3231 on I2C bus

It's an eeprom, isn't it? More write cycles than the atmega328's built-in eeprom, yes, but doesn't use battery power to retain data.

Then you are in favor of the UFOs?

Best explanation of XY I've ever seen...

I was mistaken, was thinking of the internal ram on the DS1307 that needs battery backup.

Yes, it's a shame that ds3231 has no available battery backed ram like ds1307 does. Also a shame that the designers of those commonly available boards did not add an i2c static ram chip instead of the eeprom chip. But perhaps eeprom chips are cheaper and have higher capacities, and the use cases for eeprom, eg. sensor logging, is more common.

Hmm... I'd have to say no. If the UFOs are aliens, they should stay away from Earth. Humans are stupid and dangerous. They should come back in 200~300 years to see if we have survived our own stupidity and started to become a little more civilised!

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Or like the DS3232 does...

I had never heard of ds3232, thanks @aarg

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