The site is hosted on multiple-redundant hardware, with RAID-5 SAN disk holding the primary copy. Our host keeps an hourly on-site hot spare, daily on-site tape backup, and weekly off-site archive. I personally keep a monthly off-site archive (not more frequently due to bandwidth costs... this will hopefully improve in the future).
Three different domains point here, all on auto-renew: brassgoggles.co.uk, brassgoggles.org, and steam.punqs.org.
Our site policy also permits The WayBack Machine to crawl us, though their backups only go to 2010 at the moment
their backups only go to 2010 at the moment).
Our host has been given instructions to turn server access over to another person should I be unreachable for a pre-defined period of time, and all passwords are stored in a vault that will allow my wife access should something happe to me.
There may be outages; there may even be some data loss at some point. But short of being unable to pay bills, we'll never just disappear. And that ability depends entirely on the
support of the members through donations and subscriptions. So, as long as enough people are willing to pay to keep the server online, we'll be here.

(Barring something unimaginable, of course).