Every morning (for about 2 weeks now), around 6:30 am, I get a large IO and incoming-traffic spike on my webserver. It didn't happen until a few days after I released my site. As I'm still a bit of a novice when it comes to server management, I was wondering how I would find out what causes it? It seems like a DoS attack but it seems odd that it happens at the same time every single day.
I'm using Ubuntu 12.04 Server, PHP, Apache2.