Yes, the Library/ folder is backed up, excluding Library/Caches. The forsaken docs are more explicit about which directories are backed up: https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html#//apple_ref/doc/uid/TP40010672-CH2-SW4

At least condition is if the Media Services are reset. Documentation for handling it is here: https://developer.apple.com/documentation/avfaudio/avaudiosession/1616540-mediaserviceswereresetnotificati

watchOS 10 supports selection but this is the error message shown if there are any mistakes in the type of the $selection binding. It must be an optional and conform to Identifiable.

Merge: take two string catalog files and combine them into one Split: take one string catalog file and move some entries from it to a new one The xcode xcstrings editor has no bulk operation methods or copy/paste for entries. It was easy to do this with the old strings files. Now one has to open the xcstrings file in a different text editor and to cut and paste blocks of json

Apps using the background audio mode with the common audio modes cannot actually update live activites; an update silently fails; they do not update nor do they throw an error. This is mentioned in this thread: https://developer.apple.com/forums/thread/716458 and I have confimed the behavior. This is contrary to the documentation which implies any backgrounded app can update the activity, and has wasted a lot of peoples' time, especially since it doesn't throw an error, it just doesn't work. Workarounds would be to use an unnecessary background mode like location, or spam push notifications which will update the live activity widget as long as the user receives them.