But if you've backed up your WordPress site you can restore it later on and get access to it any time you want. Even if everything goes wrong, set it up again exactly the way it was. And even ignoring database crashes you might accidentally delete something. I know I do that all the time. You might delete the wrong comment, the wrong blog post and even empty the trash and never have a way to get that back. I know that sometimes even my webhost is fixing a database issue and they will delete something without me having to do anything. So even if you think you're perfect and you never make a mistake you might delete something and it's better safe than sorry. It's worth taking those few seconds to backup your WordPress blog so that you can get it back whenever you need to.
Speaking of getting stuff back whenever you need to, would you write a 50 page term paper in Microsoft Word and never save it along the way? Of course not. You might type one page and save it, another page and save it. Why not treat your WordPress blog like a Word document? Which means you might set up the WordPress theme, now you want to take a backup right at that point. Then add in some extra posts, take a backup right there. Every week take a backup so if you ever need to get back to an earlier part, maybe you made one change to your theme and you liked it, but then changed a graphic and you didn't like it. You want to get back to that earlier change that you backed up your site at every point along the way, you can get back anything you ever need.
That's why you should backup your WordPress blog, in case your database crashes, you accidentally delete some stuff, you need to go back to an earlier version.
Either way you should backup your WordPress blog right away, right now. Use this backup plugin to safely keep copies of your WordPress blog at