On Friday the 2nd of October, the Sanctum went offline. I got a warning relatively early on from our host that the server we are hosted on had experienced an issue and that they were looking into it.
On the following Saturday, the issue was identified as our host being the victim of a Distributed Denial of Service (DDoS) attack. The time it took to bring the site back online after this was due to ordering and installing new equipment to resolve the issue.
I got confirmation that this hardware was installed late last week and the site was brought back online today after I reactivated our account.
The bad news is that this sucked. The good news is that we are now protected against future attacks.
P.S.: We didn't lose any data and our backups are up to date.