If the Snowden slides about PRISM are to be believed (and we don't have any reason to doubt their credibility), then ever since October 2012, your iCloud data (device backups, email, message history, photos, notes, et c) are available for download by the US military intelligence community directly from Apple servers, with no warrant required (rubber stamp secret police FISA "court" orders are not warrants and they have no oversight).

Apple has, of course, denied this:

“We have never heard of PRISM,” said Apple spokesperson Steve Dowling in a statement. “We do not provide any government agency with direct access to our servers, and any government agency requesting customer data must get a court order.”

Shortly thereafter, the heads of many of the affected companies met with Obama at the white house to coordinate their next steps at counteracting the damage. The initial cover story was that they were meeting to discuss the healthcare.gov disaster, but it turned out that the meeting was actually about the NSA's comprehensive illegal spying programs being disclosed.

https://www.nytimes.com/2013/12/18/us/politics/as-tech-indus...

Reuters reported in January of 2020 that an ex-Apple employee told them that Apple Legal scrapped a 2018-2020 project to do clientside end-to-end encryption of the iCloud device backups (which would render this collection useless) as a result of pressure from the US government.

"That person told Reuters the company did not want to risk being attacked by public officials for protecting criminals, sued for moving previously accessible data out of reach of government agencies or used as an excuse for new legislation against encryption."

https://www.reuters.com/article/us-apple-fbi-icloud-exclusiv...

Non-e2e-encrypted iCloud Backups are on by default for every single iOS device if it is set up with an Apple ID.

Please do not believe the Apple marketing narrative about individual privacy.