I am on a rather low monthly limit with my mobile phone plan. When travelling, I usually write mails and browse the web on my Macbook Air via iPhone Personal Hotspot.
However, I do know several system services send and receive data "in the background" when a network connection is available — but I don’t want my Mac to download hundreds of MB of system updates or similar through my costly mobile data plan.
Is there a way to temporarily limit data throughput to a set of applications, let’s say Mail.app and Chrome.app? CLI solutions preferred, but any help is greatly appreciated!