A lot of iPhone users are excited for the release of iOS 8 later today at 10:00 am (roughly) PDT, but before you download, there’s an important detail for those using a Mac alongside their iOS device to be aware of.

When upgrading, you’ll be asked whether or not you want to upgrade to iCloud Drive and are given two options. It’s very important that you select ‘Not Now’, rather than ‘Upgrade to iCloud Drive’ for one very good reason.

icloud-drive

(Image from TUAW)

Upgrading to iCloud Drive before the public release of Yosemite OS X will immediately break all iCloud syncing between your mobile devices and your Mac. The only way to get around this would be to download the beta version of the Mac OS, which we do not recommend as there may still be various problems with the operating system.

It’s important to note that this action, once selected, cannot be undone. You cannot downgrade from iCloud Drive. However, once OS X Yosemite is released and relatively bug-free, go ahead and upgrade the cloud service.

Make sure you’ve read up on our iOS 8 preparatory guide to make sure your iOS upgrade goes as smoothly as possible!