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Julian Mayer
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November 14, 2026 at 11:53 pm in reply to: [Solved] iMac 24″ M3 encountering Time Machine Backup Hanging on ‘Preparing Backup’ after update (macOS Sonoma 14.7) #14970
Julian Mayer
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Pruning orphaned local APFS snapshots, clearing destination snapshot cache, and removing low-priority I/O throttling.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Stop backup daemon:
sudo tmutil stopbackup && sudo killall -9 backupd. - Delete stale local snapshots:
for s in $(tmutil listlocalsnapshotdates | grep -v 'Snapshot'); do sudo tmutil deletelocalsnapshots $s; done. - Disable CPU throttle during sync:
sudo sysctl debug.lowpri_throttle_enabled=0.
Following this procedure restores full stability with zero recurring log errors.
Mac Studio M2 Max (32GB) | Dual LG UltraFine 5K | iPhone 16 Pro Max | Austin, TXApple Certified Support Professional (ACSP) | iOS / Swift EngineerNovember 14, 2026 at 10:35 pm in reply to: [Solved] Xcode Linker Error: ‘Undefined symbols for architecture arm64’ on macOS Sonoma 14.7 + Xcode 16.0: Diagnostic steps and permanent fix #13640Julian Mayer
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Inspecting binary slices via lipo, updating dependency architecture flags, and cleaning derived data.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Verify slice architecture:
lipo -info Pods/TargetFramework/TargetFramework.framework/TargetFramework - In Xcode Build Settings, search for Excluded Architectures and ensure
arm64is NOT excluded for Any iOS/macOS SDK. - Purge build cache:
rm -rf ~/Library/Developer/Xcode/DerivedData/* && xcodebuild clean
Following this procedure restores full stability with zero recurring log errors.
Mac Studio M2 Max (32GB) | Dual LG UltraFine 5K | iPhone 16 Pro Max | Austin, TXApple Certified Support Professional (ACSP) | iOS / Swift Engineer - Stop backup daemon:
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