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PS: tou probably should also disable logging into friends, Steam overlay and cloud storage.
If you are online and playing and then not online it will boot you from game. However, if you start the game offline then you are fine assuming the game itself doesnt require online.
Now some games like 7 Days to Die default to you using 'anti cheat' which requires online. but in that example you just start 'without anti cheat' and your good offline. I am not sure if other games use similar add ons but they should be easy to find/disable at game start up.
Also, games download on your box are download regardless of internet provider so you will not have to download them again. I am not 100% sure on that but prettty sure
He's wondering if you can back up those credentials and then replace them with the copy in case they're cleared.
*EDIT*
I believe that even if you're set to offline mode, steam still checks for internet and may even perform actions, such as verifying those said credentials.