When the one ui 7 beta ends, will I have to reset my device completely and lose all the data? If so will I be able to back up now while I have the beta installed, I didn't back up before I installed the beta.
After One ui 7 beta ends you will get final release (official) you will update as you would normally update your phone so you won't lose any data, unless you want to reset your phone after beta finishes and set up as new device.