From this web UI, as in El Capitan, you can remove devices from your iCloud account — including a machine that’s died or been sold.
There’s also a “restore files” option — the beginning of a backup solution for Apple’s iCloud services. It’s limited to iCloud files, Contacts and Calendars — there’s currently no support for restoring Notes.app files (sadly). I didn’t see any way to accelerate deletion of files — once data goes to the Cloud it is beyond our control.
Restores are all or none — you can’t restore only some Contacts.