I've got ... just a little bit more on my online computer. My offline one has a lot more. I guess it depends on how much risk you are willing to take. But so far you go the right idea.
Did you check out the armory offline downloads?
The armory offline bundle is only for ubuntu 12.04 exact. My live boot is 14.04 LTS which means I have to use the normal download. However I cannot install this without connecting to the internet so that ubuntu software centre can install the packages. This means having to connect to the internet just once which defeats the point. Same thing for any program on ubuntu. It's pissing me off to no end.
i've been thinking about doing the same thing for some time now to use as a cold storage. i think i am gonna do it now that i read this

and as far as i know uploading "Encrypted" wallet backup to google drive can be safe and you can change the name and type of the file too, like changing it to "crocodile.webm"

How do you change the .wallet ending without fucking up the file?