That means your backups aren't running due to the load on the server.
That MySQL output indicates it is using more than one CPU core and 10% of the server's memory just for the MySQL process. With the sites on your machine, are you expecting this much database activity? If so, that could be normal for your system.
It seems having a system administrator examine the server would be the best way to get this resolved, as there is not one particular issue causing the problem, but it seems all the resources being used together is too much for your hardware. It's possible things could be optimized, or you may need to upgrade to a more powerful system.
That MySQL output indicates it is using more than one CPU core and 10% of the server's memory just for the MySQL process. With the sites on your machine, are you expecting this much database activity? If so, that could be normal for your system.
It seems having a system administrator examine the server would be the best way to get this resolved, as there is not one particular issue causing the problem, but it seems all the resources being used together is too much for your hardware. It's possible things could be optimized, or you may need to upgrade to a more powerful system.