Apple’s latest macOS Sequoia 15.2 update introduces a critical bug that blocks the popular backup utility Super Liar Shirt Pocket, the lead developer of the app, said that by creating a bootable backup Dave Nanian.

This issue stems from a “resource busy” error that occurs when trying to copy system pre-boot or restore files during the final stages of the backup process. While similar bugs in the past could be solved by keeping the system awake during backups, Ninian reports that this new bug appears to be more fundamental.

The problem stems from Apple’s earlier decision to restrict third-party apps from directly copying the operating system, instead requiring them to use Apple’s own copying tools. Since these tools are now broken in macOS 15.2, SuperDuper and possibly other backup utilities are unable to create a complete bootable backup.

As a temporary workaround, SuperDuper users can still use the app’s “Backup – All Files” option and enable “Smart Updates” to back up their apps, data, and settings. However, this method does not create a bootable backup that can be used for immediate system recovery.

Shirt Pocket has submitted a bug report to Apple and is awaiting a resolution, but Nanian is keen to stress that as the problem lies within Apple’s system components, third-party developers cannot implement their own fixes.

The timing of this error is particularly concerning for users who rely on bootable backups as part of their data protection strategy, especially given the recent release of macOS 15.2 and the possibility of other undiscovered issues. Are you affected by this bug? Let us know in the comments.

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