A:AnswerNot sure about “all”...but it does have Google Doc. Since they are both claiming Chromebook status, my best guess, having not used the Acer, is yes.
A:AnswerSince it is not upgradable, my suggestion is an external hard drive. They’re really quite reasonable now. I’ve seen them in 1+ TB sizes for around $100.
A:AnswerEnd of life will typically be when Google stops supporting the hardware. Since this is running on an Intel Celeron it probably won't be any time before the battery stops holding a charge. Which is usually about the time people just buy a new model.