For describing a connection to a server, what noun ("server", "cloud", etc.) is more recognizable to users?

In an app (web and mobile) I'd like to provide information to the user when they're no longer connected to the server. The app will still work while offline but will be missing some autosave and sync features. What is the most recognizable terminology for this? Some examples:

• Connected/Disconnected from the cloud
• Connected/Disconnected from the server
• Session connected/disconnected
• Connected/Disconnected from the internet (don't actually know if their entire connection is good though)
• Online/Offline (same issue as "internet")

Please provide examples from popular apps/websites, or relevant studies.