Managing over 100 sites can be quite complicated, so I tend to only check up on the bigger ones. As most of my sites don’t require much maintenance some go for months or even years without updates. This used to create problems in the past when I’d have some errors on sites or if they went offline and stayed like that for days and even months until noticed and fixed, which naturally caused significant financial losses.
So I finally got around to it, did some research and picked a simple uptime monitoring service monitor.us. There are many others that do the same, but this one is fairly easy to use, only takes 2 minutes to set up and it’s free! The free version checks your sites every 30 minutes and emails you if they are down. This is more than enough so I didn’t need the paid version. It also emails a weekly uptime report with average response time from different locations – that’s how I found out that hostgator shared accounts had a meager 93-99% uptime with response time as slow as 1 sec, while IBH was almost always at 100% and over 10 times faster.
Google webmaster tools, as well as other similar stats providers, also have a similar service and would send you an email alert if your site is offline.
It only takes 2 minutes to set up so go and open an account at one of the free monitoring services, add your main email and several of your main sites over there and it can give you some peace of mind knowing that if your sites are offline you’ll be the first to know!