There is a white paper on SSD and heat popping the electrons out of there trapped memory spots. I will have to search it. But an unpowered SSD in 40C will start showing signs of data loss in a week, hotter temps and your a could be gone in a month.
HDD, yes run it always instead of stop start
I've done a quick search but have not located the science article yet, I will check later. However the ssd standards have this. The device should meet that, but as you can see if you had a hot closet in India your data could be gone in 3 weeks.
Per JESD218, a client class SSD must maintain its data integrity at the defined BER for only 500 hours at 52°C (less than 21 days) or 96 hours at 66°C (only four days).