GUI for files size

OMV is incompatible with a GUI installation.

You can use the filebrowser plugin, use a docker like webtop or something similar, or look for something like Midnight Commander.

Quote from Indyrectelex

Is there a GUI debian-based I can install on OMV so I can see where are files that take more space?

ncdu on CLI.

Quote from Indyrectelex

I installed webtop on docker in an attempt to have a sight on the size on my files, but actually its like webtop have its own directories.

In order for Webtop to "see" your file systems you must address them within the container. In the "volumes" section define the routes you need.

Quote from Indyrectelex

I use WinSCP but I cant see the filesize. WinSCP will give the size of my files but not the size of the folders where the files are stored...

In WinSCP you can click on any folder, then click properties, then calculate. It will tell you the size of the folder.

Quote from Indyrectelex

I dont understant how to assign the right path for a webtop volume to get the root directory of OMV itself

It is not at all recommended to map the / folder inside a container, you could have serious problems if the container starts doing... anything in /

I also don't see why there could be any reason to do so, and I never would.

That said, you can map any folder inside the container, just define your system folder on the left side and the folder inside the container on the right side of :

This would be an example to map /

/:/host_root

By doing that you would be able to access the /host_root folder inside the container and you should see the contents of / of your server.

I insist, I don't know why you might need to do that, surely you can map other less dangerous folders for what you need to do. For example

/srv:/host_srv

would create a folder inside the container where you can access all your drive mounts.