Backup Your Data
If you don't have a ton of time to commit to the pre-installation process, be sure to at least follow this step. It's important.
Before you start the iOS 12 beta download on your device, make sure you backup all of your important data.
Data loss issues are rare, but there's always a chance something could go awry during the installation process so it's important to keep your data (photos, video, work for school or your job, etc) safe before making the move.
If you don't know how to properly backup the data stored on your phone or tablet, we've put together a guide that will take you through the backup process via iTunes.
If you don't want to backup your device via iTunes, you can also backup your important files using Apple's iCloud service.
This might seem tedious, but it could save you from a serious headache.