I currently have the problem that my router was hacked. Among other things, I noticed this because a DNS hijacking was operated. Unfortunately, the router and NAS had the same password. I need to somehow find out if and what data was tapped. Is there logs about data transfer activitys and logins?
WD has a number of Knowledge Base articles on how to collect system logs. Note that it has been repeatedly asked in the past for ways to see who has logged into the My Cloud. You can use the forum search feature (magnifying glass icon top right) to search for those past discussions and posts.