Web Apps: How do you protect and backup my data?

All of the presenters at the Future of Web Apps summit who run web apps talked about hosting and then discussed the importance of a good backup system. In my interview with Ted from Dogster following the event, he mentioned how his first backup app didn't run correctly and he lost a bit of data.

So this morning I get up, hit the power button and get a message that says "NTLDR not found" — lovely right? There goes all my data. Luckily it seems the bios changed the boot order and when I switched the hard drives boot order, the machine booted again. Then I get an email from a friend that his hard drive crashed last night and is reinstalling Windows from scratch. What fun that is, not to mention what data might be lost. So I immediately did a backup of everything on my hard drives to my external drives. So if this pc dies, I have everything backed up.

So then I thought about CenterNetworks and my other sites. Is the backup working correctly I wondered? So I checked and yes, the nightly backups are working as intended and everything looks good. So your comments, posts, etc. are all safe in multiple locations. I can't share the locations because I would have to silence each of you!

And then I see this post from Bridget at Toggl about how Toggl manages your data including backup and protection.

A note from the post:

Because you are trusting our application to hold your valuable meeting and time tracking information, the security of that data is incredibly important.

I think it is great for a growing company to say: Hey this is how we protect and backup your data. This is how we ensure your data is not going to be lost in the event of a hardware failure.

So I issue a challenge to the other web apps out there that collect and store user's data: Share some details about how you backup and protect our data.