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Vincent Silva
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November 14, 2026 at 11:11 pm in reply to: [Solved] How to fix Time Machine Backup Hanging on ‘Preparing Backup’ caused by APFS snapshot journal comparison deadlock over SMB network share on iMac 24″ M3 #14272
Vincent Silva
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.
Apple Vision Pro (512GB) | MacBook Pro 14″ M4 Pro | AirPods Pro 2 | Dublin, IEApple Certified Support Professional (ACSP) | visionOS Spatial Computing DeveloperVincent Silva
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Increasing I/O buffer sample size, maximizing processing threads, and freezing high-CPU synth tracks.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Navigate to Logic Pro > Settings > Audio > Devices and set I/O Buffer Size to 512 samples (or 1024 for mixing).
- Set Processing Threads from ‘Automatic’ to the maximum available performance cores.
- Enable Track Freeze on tracks with resource-heavy synthesizers or convolution reverbs.
Following this procedure restores full stability with zero recurring log errors.
Apple Vision Pro (512GB) | MacBook Pro 14″ M4 Pro | AirPods Pro 2 | Dublin, IEApple Certified Support Professional (ACSP) | visionOS Spatial Computing Developer - Stop backup daemon:
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