Uninformed speculation here in, and enthusiastic agreement with Jake Mannix (Vote #1: Jake Mannix’s answer to Does Quora have “survival plans” in place, in case its main staff is wiped out?)
Does Quora have contingency plans in place of hardware failure of disks? Yes, inasmuch as Amazon cloud servers do; if Amazon does not have backup and contingency plans in case of hardware failure, a whole lot of enterprises are screwed.
Does Quora have contingency plans in case of a massive natural disaster in Silicon Valley? The prudent thing for them to do is to have them, but with users not paying for the privilege, and with Quora not yet monetised, there would have been less incentive to do so—that kind of contingency costs money, after all.
Over and above what Jake says—which should be seared into every user’s brain here: recall that Quora does not allow the site to be spidered by archive.org, for fear of people not being able to delete their posts clear off the internet. So if Quora goes belly up, as many an unmonetised Silicon Valley startup has done, no, there is no contingency plan for the community.
As I say whensoever this issue comes up: read Brian Bi’s answer to When, and how, will I be able to download all of the Quora content I have produced, like the Facebook and Twitter feed export options?. And if you can’t run Python scripts yourself, find someone who can on your behalf.