Unauthorised entry, log of logins per user of specific business

Can I see or request a log of when which user logged in to a specific account?

Am facing a malicious actor that manually deleted all bookings from one of the companies zi manage tbe books for. There is a recent backup avable offline so it can be restored till 13/12/2025

Am gathering evidence as I have a strong suspicious which employee of said company is behind it

It seems that person gained access to another employees account and used that to do harm