Randomly all logs disappear

Hello,
I was checking my logs and they are all disappeared from 22 March.
Infact my backup passed from 450mb to 170mb…
Can somebody help me to figure out what happened, how can I check what happened at that time? There is some log about system update or other stuff.
I lost the whole logs and I don’t know how to restore it now…
It was about energy consumption.

Thanks