This has happened to me. I had a 20" 2008 iMac and let the HDD sit idle for too long and it wouldn't start back up. I had the 128 GiB SSD fail on my rMBP (Apple had a bad batch of Toshiba drives in their first run of rMBPs.)

That's why I started using DropBox in the first place.

I have every MS Office that I've ever made. 1996-forward (Sophomore year of University ... I'm not sure that I can open them any longer.)