High disk usage

Hi support

I have not access my wordpress for more than half a year. Recently I am receiving warnings from the server that there is a very high disk usage.

My store has around 8– products, each has two different attributes: color & size

There are too much disk space usage under this directory /usr/local/lsws/cachedata/

I read from another thread that I might have too many query strings and attributes and products in store but I have already included all the attributes under drop query string settings.

There is another setting under cache>excludes>Do Not Cache Query Strings

What is the different between drop query string and do not cache query strings?

Is it safe to delete all contents inside this folder /usr/local/lsws/cachedata/*