Bug in macOS 10.15.5 Prevents Bootable Backup


Apple’s new macOS 10.15.5, released earlier this week, faces a major problem, although it includes many improvements. Due to an error in the new version, users are having trouble getting a bootable backup.

Apple released the new version of the operating system macOS macOS 10.15.5 update to all users earlier this week. The new update included several bug fixes and performance improvements, as well as including the Battery Health Management tool that extends battery life on Macs.

Despite all these good news, bad news came with the new version. Due to an error in macOS 10.15.5, Mac users cannot get a bootable backup on macOS Catalina. This bug is not new and was also included in the beta version of macOS 10.15.5. The error, which is also included in APFS, fortunately only affects new backups in the latest macOS version 10.15.5. So backups taken in macOS 10.15.4 and lower are not affected by the problem.

Worse than a mistake:

According to Mike Bombich from Carbon Copy Cloner, who discovered the error for the first time, the error works as follows: The chflags () system call can no longer place the SF_FIRMLINK flag in a file in APFS. While this is happening, the system silently fails instead of giving an error code to make the users understand the situation.

The surprise is that Mike Bombich reported this issue to Apple on May 18th, but the issue was included in the release. Bombich says this may be a security fix that prevents third parties from using information, but what’s happening is ‘worse than error’.

If you already have a backup that already exists, you don’t have to worry about the malfunction in macOS 10.15.5. However, if you made a backup with the current version, macOS 10.15.5, be sure to do this with the latest beta version of Carbon Copy Cloner.


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