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I know this is an old thread, but I wish my Macbook had a hard switch to disable WiFi. A doc I had stored in the cloud got corrupted and I was worried the Mac would sync with the corrupted version before I had a chance to switch off the WiFi and save the good copy on the Mac. A hardware switch would have allowed me to do that even before fully booting. It's arrogant to assume that because Apple didn't design a certain feature in, nobody should ever need it. If that was the case Apples would never evolve or improve.
 
I know this is an old thread, but I wish my Macbook had a hard switch to disable WiFi. A doc I had stored in the cloud got corrupted and I was worried the Mac would sync with the corrupted version before I had a chance to switch off the WiFi and save the good copy on the Mac. A hardware switch would have allowed me to do that even before fully booting. It's arrogant to assume that because Apple didn't design a certain feature in, nobody should ever need it. If that was the case Apples would never evolve or improve.

If you're running Lion or later, and a compatible app, you should have a version history you can use to restore to good copy of the doc.

But, if you really need to be "off the grid", you could: turn off your access point (Airport Base station or other) or, disconnect your cable/dsl modem?
 
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