First connect to your CentOS VPS using an SSH client like Putty.

A simple command to see how much storage folders are using is:  du -hsc *

You can use this at the root level “/” though often storage is used by a folder under /var /usr /tmp /home, or /root.

It’s often quicker to change to one of these directories first, for example using command:  cd /var

Once you see a directory using a lot of storage change to that directory using the cd command and enter du -hsc * again to see what storage the directories under it are using.

To see a listing of files and their sizes in the current directory use command: ls -alh | more