High disk space usage

Hello, I’m having some trouble figuring out why the disk space on my M10 almost doubled in about an hour.

I have just one database with “significant” usage, but not coming anywhere close.

I don’t think the backups contribute since there wasn’t another similar increase since then (almost a week ago).

How can I approach this? Is there a place where I can see what this disk space is being used for?

Thanks in advance.

Here’s more information:

Is the large file system size from preallocations? If so, it seems a bit unbalanced with the actual db size. I didn’t have any spikes of temporarily storing a lot more data which could trigger a bigger preallocation.

And here’s a better view of the disk usage increase: