Sorry, I had understood that the Curie temperature had no relation to the demagnetism of 2.5" HDDs. If it has no relation to HDDs, high temperatures in residential areas, for example 36C, would cause demagnetization in the long term.
Fires are rare. I am only referring to home temperatures in tropical areas above 30C, and in my city 35-36C, so when I mention demagnetization, I am only referring to temperatures in this range.
To prevent bit rot, is it necessary to copy the data to the PC every year and copy it again to the HDD? What type of annual check is necessary? All of them generate a lot of heat in the 2.5" HDD, but I just opened Crystal DiskInfo.