Read this before turning on iCloud Drive in iOS 8!
When you upgrade to iOS 8, you're asked if you want to activate iCloud Drive.If you're running other devices that aren't being upgraded to iOS 8, or if you have a Mac, it's best to say no for right now. Here's why.
iCloud Drive enables you to share files in the cloud. But iCloud Drive doesn't have backward compatibility with iOS 7, and on the Mac, iCloud Drive won't be supported until OS X Yosemite is available.
iCloud Drive provides a framework for you to share files in the cloud, and it's also how apps that depend on iCloud will sync their content. That's going to create some problems if you've got software that you depend on — and devices that you depend on — which can't all sync through iCloud Drive.
As an example, Nik Fletcher with Realmac Software posted a FAQ explaining the issue as it affects their Clear software, which relies on iCloud for syncing:
Day One, the popular journaling software that runs on iOS and OS X, has posted a similar warning in their support forums:
Similarly, Ginger Labs, makers of the popular note-taking tool Notability, warned its users that syncing will be disabled between iOS and OS X versions of its app until Yosemite is out:
Bottom line: If you're only using one device, if all your devices have been upgraded to iOS 8, and if you're running the Yosemite Public Beta or a Developer Preview release of Yosemite and you're comfortable with how things are going, then you can probably pull the trigger on iCloud Drive safely.
But if you're still using Mavericks and iOS 7 on some devices and you rely on iCloud to sync data, hold off until you're ready to move everything up to the newest release. And for Mac users, that may be a wait of several weeks as work continues on OS X Yosemite.
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