The disk usage for one or more of your partitions is ruing low

Hello,

Sorry if this is something that is asked a lot around here but i'm out of options.

First of all some info:
I have a VPS ruing with the following specs: 2 cores / 4.096 MB / Directadmin 1.5 + CentOS 7
With a Harddisk of 150GB SSD.

The Problem:
About a couple of weeks ago i'm getting the message:

Now i've searched the web, with some basic solutions.
Delete old backups and check out where the space is lost.
Done that, but now with even zero backups are being made i got the same message (See above)

With my host/provider i've searched by terminal on the machine it self and get some weird info. (See picture links below)
VPS_-_DA-Disk_Usage.png
vps_-_DA_DF.png
My provider will not help me any further and i found out there are some weird backups in the folder(?) called: vg_directadmin-lv_root

My knowledge of linux is just bare minimum so maybe someone can help with this or has a walkthroug/tutorial?
Because ruing random scripts is not my thing because dont know what it does.

Thanks in advanced!

Regards,