You can risk a mess of inaccessible files, because of permissions if you replace the new Pictures folder, with the old one. Copy the items from the backup folder, to the corresponding folder in your Home folder (Contents of the Pictures folder on the storage device, to the Pictures folder in your Home folder). When copying your backup files back in place, don't replace any of the standard folders.So you will have your activations intact. IF you use iTunes purchases (Movies, music and all that), and Apple Music, make sure to deauthorize before wiping.(Checking you have enough storage in iCloud, maybe going to to verify your latest photos and video are there), if you don't use iCloud library, don't delete the file. iCloud library will re-download all your photos and videos, just make sure all photos and videos are synced to iCloud, before wiping your Mac. IF you use Apples Photos app, WITH iCloud Library (syncing your photos to iCloud), go to your storage device, and delete the Photos library file, otherwise you will have trouble.When you have connected your external storage device (USB stick or harddrive), simply copy everything from your home folder to a folder on the storage device.Hold down 'CMD' on the keyboard and press A (To select all folders and files), and keep holding down CMD, hold down ALT too (the key next to CMD), and press I on the keyboard (I as in Ice) this will bring up a window, telling you how must stuff you have.Open a Finder window, click 'Go' in the menubar and select 'Home', this is the folder where most of your stuff is located.A USB thumb drive or external harddrive depending on how much stuff you have, help is further down the list Get an external storage device for your backup.

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