Sorry about the delay, I had some vacation coming up 😉

I found the problem though!

It turns out that it wasn't too happy about the compression. Actually, that WAS the problem...

I think you missed the point.

I connected an external harddrive to the server and use that to put the backup on.

Ofcourse that will give me more space 🙂

There's more than enough free space, 128GB total. Each backup takes up about 70-80GB.

The drive's also compressed.

G: is a USB harddrive that I've connected because there's not enough room on the other drives in the machine.