In the documentation for the Contact Provider Extension contact provider it says
This allows apps like Phone and Mail to provide personal names and images for incoming calls or messages when your app knows the caller or sender. Instead of adding contacts directly with the Contacts framework, your app provides read-only contact items that it can update, and which the person using the app can easily enable, disable, add, or remove.
Contacts stored in Phone/Contacts are getting backed up via iCloudBackup... what about contacts provided via the Contact Provider Extension? Are they also subjected to iCloudBackup, similar to the "regular" contacts? Thanks!
Contacts stored in Phone/Contacts are getting backed up via iCloudBackup... what about contacts provided via the Contact Provider Extension? Are they also subjected to iCloudBackup, similar to the "regular" contacts?
They are not. These contacts get stored in a separate container and do not sync with iCloud contacts.