How to do a sever cleanup if your using VestaCP?
If you want to do a server cleanup and remove files that are taking up a lot of space you can run cron jobs that will do this for you. You should only do cron jobs if you known how to step them up and have them execute properly, if not you can do this via root access.
You can run the below command and change minimum value shown in red to see what big files you have.
find / -type f -size +20M -exec ls -lh {} \; | awk '{ print $NF ": " $5 }'
Source: https://forum.vestacp.com/viewtopic.php?p=59294&sid=3537d446058880613b3c46f2cccabc1b#p59294