Okay, so that covers the data on my PC. What about my WebSites? If you run your own WebSite, you can usually just back it up via FTP. SyncBackSE does that, and so do other tools. Essentially, they just download the whole site every day. If you run WordPress, look at the database backup plugin. I have configured it to send me an e-Mail with a database dump of the blog every week, so I can always restore it and lose a maximum of a week (although archive.org and Google Cache may even save my ass here). If you do not run your own WebSite but are using a Hosted Blog, get familiar with the backup utilities of that platform. If your Blog Provider does not allow you to easily back up your data, change. I'm serious - there are so many blog hosting providers out there that offer an easy way to make backups, there is really no reason to waste your time with a company that does not care about your data.
The above strategy served me well at first, but I wanted some more. Tomorrow I will be posting about my current strategy, but let me just close with emphasizing again that no one else but you is eventually responsible for making backups, otherwise you may land really hard one day.