feature request: backup original or restore to Apple default

[mcclint680]

In tinkering with Gas Mask, I've discovered it is entirely too easy to completely and accidentally delete the hosts file and have none in place. I would suggest that there be a button to click to make a backup of the hosts file as it exists at the time before any modifications are done by Gas Mask. Another helpful thing would be a way to click a button and set the /etc/hosts file back to an Apple default configuration to start off at the beginning again if necessary.