That sounds totally normal.
The airflow over the CPUs is not the same. My right CPU (as seen from the front) is always 2-4C hotter than the left. Under load, and if I have 16 spinning rust in the front, the right CPU may well be 4-5-6C hotter.
I wouldn’t worry about it.
Some data are backed up to a local NAS, some of that data is backed up to cloud (not Google or the big ones).
Most of my data aren’t important. Photo library is both local, in the cloud, and most on offsite DVDs.
~45K lossless music files is local and cloud. Those would suck losing, but I could rip them again.
I’ve been considering tape backup again, it’s like 20 years since I used it at home.