After my Touch ID wasn't working properly on my ~3 week old iPhone 6S, I was advised by Apple to reset my phone to factory settings and then restore my iCloud backup. Everything worked fine, except there's a lot of data missing from my backup: Health data - all completely gone App data - login information all gone (not so much of an issue), app data all gone (big issue e.g. sleep analyses from Sleep Cycle) Apps crashing (~80% of my apps crash instantly upon opening) Been on and off the phone to Apple support for 6 hours now, and no luck. Seriously not impressed. So be warned before you trust iCloud backup with lots of Health data.