If you tether your PC to the cellular connection of your phone or tablet while traveling, you might want to check out this app.
From David Sparks at Macsparky.com...
There’s a new version of TripMode out. I’ve written about TripMode before. It’s a Mac app that will monitor your internet traffic and selectively turn off apps. This can be a lifesaver when tethering. As a quick war story, I once had a very large podcast file come in over Dropbox while I was tethering my Mac and burned through a month’s wireless data in about an hour. With TripMode, when I tether, I turn off Dropbox so that doesn’t happen.
I have been looking for an app like this for a while. The idea of tethering my Mac to my iPad’s data connection while I am away from a reliable wireless network is appealing. I always worry about the data that my computer is hogging throughout the various processes that run in the background (things like Dropbox and photo app syncing). With TripMode, that is no longer a concern. You can download TripMode 2 here.