Before you upgrade

Check compatibility
All Macs introduced in 2010 or later are compatible. MacBook and iMac computers introduced in late 2009 are also compatible.
See if your Mac is compatibleBack up your Mac
Creating a backup is simple, important, and we recommend it for everyone.
Learn how to make a backupHave your Apple ID ready
Your Apple ID is the account you use to access Apple services like the App Store, Apple Music, and iCloud. It also lets you take advantage of new features like Universal Clipboard and Auto Unlock with Apple Watch. You need to enter your Apple ID and password after upgrading.
Get help with Apple IDNew features in macOS Sierra
macOS Sierra is full of smart new features like Siri, Memories in your photo collection, Universal Clipboard, and more.
