Apple's current server status page outlines those affected by the outages and general issues. At the time of writing, these include:
- Back to My Mac
- Documents in the Cloud
- Find My iPhone, iPad, iPod touch, and Mac
- iCloud Account & Sign In
- iCloud Backup
- iCloud Drive
- iCloud Keychain
- iCloud Mail
- iMovie Theater
- iWork for iCloud beta
- Photos

Apple's famed for the "it just works" slogan, although in this case, it couldn't be farther from the truth. Hopefully, iCloud will make a quick recovery, and have services back up and running very soon.
We'll update as and when these technical issues are resolved.
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