I switched from Microsoft PC + Samsung Galaxy to iMac + iPhone recently. I love the overall smoothness and experience. BUT I still stick to my old way of managing image files (which is dragging and dropping, folder-to-folder system). I am scared to start using Apple Photo app. There are loads of information about it but it still looks confusing. Please help me to understand: 1. I keep all my images and video files in various folders on my iMac and external hard drives. So if I drag and drop all files from those folders into the Photo app, can I just delete my old folders as Photo app creates it's own in-app library with duplicates? 2. Is it possible to make periodically a back-up of Photo app with its files and folder structure? Or just simply save all its folders (including folders structure) to external drive? What if I move to another Mac computer in the future? Can I recreate my previous Photo app folder structure on my new Mac? If I can save the backup, I can simply recreate everything on my new computer. P.S. I cannot afford to pay 20 USD every month for big iCloud storage, and my images folders are big. THANK YOU FOR ANY HELP!