Copying full content of Windows C: drive using rclone is very bad idea unless you think it thoroughly and do a lot of work managing exclusions and potentially locked or changing files to ensure your "backup" consistency. Such copy not only wastes your destination space but has very limited use when it comes to restore.
You want backup? Use backup software which rclone is not.
Gosh this is just an example that there are 2 disks with any names except "C", I'm not going to make a "backup" of the disk with system files via rclon 
rclone can use webdav, as a source and as a dest.
might want to read about filters, such as --exclude=/windows and other filters such as --exclude-from, --filters
what would the command look like in this case?
rclon sync \\mydisk\folder\ gdrive:backup doesn't work(
that is a smb|samba network share, not webav server.
check out my howto guide about rclone + smb|samba
https://forum.rclone.org/t/how-to-access-smb-samba-with-rclone/42754
for webdav server, https://rclone.org/webdav/
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