Why should you worry about backing up your site? If you are self-hosted, you may be thinking your host server is backed up, and that may be true. Thankfully, backing up your site is simple and free with one WordPress plugin and Google Drive.
While it may seem unlikely that your hosting company would go under or their servers with your data would get hacked, the truth is that by not backing up your site, you are putting all of your content at risk. I feel better having more control over my own data. After all, I have put a lot of work into my websites.