1) The new Control Panel does not provide a tool for managing cron jobs. Bob has said these will continue to be handled as on the old server, ie we have to raise a ticket to get them set up. But the ticket goes to Plusnet not to Hostopia.
2) I think the space used figure in the top magin will include space used by MySQL database files and various site and database dump files used by Hostopia during migration. There are also numerous backup (.bak) files. In time such files will need to be tidied up/removed (by Plusnet/Hostopia). It looks like the top-row value is the one we need to keep within, but as far as I'm aware policing will be a manual process so sites shouldn't disappear without warning.