What happens to the hard contents when I replace the computer's motherboard?

pu1. The motherboard doesn't affect the hard drive, so the data won't be erased

2017-11-13

OK

pu2. I think it's better to back it up in advance in case it's going to be shocking if it's being repaired with a whole computer

2017-11-13

OK

pu3. You can replace the motherboard without the hard disk

2017-11-13

OK