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Here is how to get there: At the top of this same page, click on "Develop" Click on "Documentation" Click on "Technologies" In the dropdown, select a version to highlight changes At this point, you should be able to scroll down the list, expanding each framework to see the changes (modifications, additions and deprecations). Alternatively, you can directly navigate to a framework documentation page, and select one of the available options from the API changes dropdown. Example for UIKit: https://developer.apple.com/documentation/uikit?changes=latest_major

I was able to get 2 or 3 backups complete since upgrading to Catalina. However, I haven’t been able to do a Time Machine backup since July 19. I’ve tried running Time Machine for several days, even longer than a week, maybe two, and it has never managed to finish. Time Machine seems stuck in “Preparing Backup”. I’ve tried turning off Time Machine and deleting the “.inProgress” backup directory, without success. Even after restarting in recovery mode I was having a hard time deleting the contents of that directory. Using “chmod -N” seems to work well to delete some subdirectories. So I started doing that. However, all commands seemed to get stuck on tmpoutboundsharing, making me think the disk (external USB3)m drive) was corrupted. When I finally managed to list the contents of tmpoutboundsharing I looked it up online and found this post. Exactly same issue, looks like, with thousands, maybe over a hundred thousand, files listed. I’m in the process of deleting them now. My next step, if successful, will be to re-enable Tima Machine while excluding backing up Photos Library, which I have shared across my devices on iCloud (~70k pictures and videos).