1. Back Up Your Site Regularly (and Prior To Updating Anything).
To avoid any worry of an upgrade damaging your site, ensure to support your site prior to you install any updates. You're spoilt for choice with alternatives on this front.
Our very first recommendation would be VaultPress if you're looking for possibly the quickest and most convenient solution. Developed by none aside from the folks at Automattic, it's a slick and full-featured premium remote backup option that's a cinch to setup and use.