problem with size on hosting

Hi,
First please excuse me because my problem is not related on MODx but maybe someone can help me here, my problem is about size on hosting server.
I have 50MB space on Linux server and i only have MODX + about 3MB files(such as images) with a few pages on MODx database and my plan is not professional for installing extra softwares on it by my hosting too . when I installed MODx it take about 20MB of my space but after several months my web disk is full while i have not added any heavy files in the other words some files on my server is growing and i don’t know about them. there are two heavy files in site root which i know they have grown:
core.13779 size:20MB type:text/x-generic permission:0600
core.30156 size:13MB type:text/x-generic permission:0600

now i have no space on server to upload new files.
please use your experiences to help me.

Thanks
AHHP

Those are core dump files that contain detail stack track information for debugging. These likely get generated when the PHP module crashes Apache (possibly due to a server misconfiguration or PHP bug). I would download a copy of them (or tell your hosting provider about them, so they can remove them after investigating what it is from if they are so inclined), and simply remove them.

Thank you for your answer and information. it solved.