Recently we've been working on file-based backups on macOS 10.15.7. When I finish the system volume group backup, including
- The system role volume, default volume name 'Untitled' usually
- The data role volume, default volume name 'Untitled - Data' usually
Next step, I launch Migration Assistant and choose "From a Mac, Time Machine backup or startup disk" to restore volume data.
But when I select the backed-up system role volume, a warning message poped up and tell me "Volume contains a macOS or OS X installation which may be damaged". I try to rebuild folder firmlink from /usr/share/firmlinks before backing up data role volume, like the following steps:
- Add SF_FIRMLINK by chflags to folders on system role volume
- Add extened attribute com.apple.fs.firmlink which value is target file name
- Make sure other attributes(creation time, permission, owner, group, etc) are the same between source and destination
But it still doesn't work (I check inode number on backed-up system role volume by "is -ailO").
I search some informations and find this blog：
- https://bombich.com/blog/2020/05/27/bug-in-macos-10.15.5-impacts-bootable-backups-weve-got-you-covered.
So my question is "How do I recover firmlink between backed-up system role volume and data role volume?" Thanks a lot