Web server consumed all space without touching the server in last many days

Hello Guys

I just found something i rarely check my server after installing CWP I love CWP but i found disk space going used automatically OR say my disk space filled without any uses without anyone touching it i don't know why. Can anybody help or need anymore information to solve this problem please its urgent 

i need someone help urgent

delete the apache logs (access and error logs)

check /backup directory and delete unwanted backups.