Is there a way to see how much data is on a server?

Is there a command or option that returns the properties of a server, including the amount of data that is on it in gigabytes?

FTP does not have such a command. A client would have to search for files and sum up their individual sizes by itself. And that could take *very* long (e.g. for a lot of small files, like in a web page).

Please look at this article
https://www.smartftp.com/support/kb/how- ... f2552.html