Why you should back up your devices? 

Because, even if you store all of your music purchases, app purchases and images in iCloud and all of your spreadsheets, reports, and fan fiction in Dropbox and start from scratch on your device whether it's a laptop or mobile, is time-consuming, frustrating and can stifle your productivity over a long period of time. https://ipsnews.net/business/2021/11/12/the-photo-stick-omni-review-best-backup-device-for-you/