Seconded. Corporate network only as the place from where company managed clients are allowed to access production network, where the data stays. Even when someone manages to steal all the electronics from the office, he still doesn't get any data/source code/whatever. Easier said than done though.

And you're still going to have to do a lot of work to prevent exfiltration from the servers other than for backup-purposes and track your back-ups and who has access to them.