Friday Afternoon Downtime
starbeamrainbowlabs.com was down. The reason for this is unclear, but it seems that this site's hosting provider, OVH, was doing some maintenance. The site was down for 29 minutes.
Get your server to notify you during the shutdown / startup sequences
Using a service like Uptime Robot is great to monitor your website's uptime, but it is a much better idea to have your server send you an email when your server goes down. That way you will know whether the server got a chance to shut down correctly or not.
Backup often, and before / after major changes
You should take a backup (preferably automated) often - I have a scritp set to do this every week - but you should also backup before and after any major changes that you make.