- A completed copy does not verify startup selection.
What changed
Shirt Pocket's September 14 update offers SuperDuper 4.0.6 and describes work on disk images, cloud storage and macOS 27 support. It also warns that configured bootable backups may not appear in the operating system's startup selectors. The developer says copying completes without an error and attributes the selection problem to Apple.
Why it matters
For teams relying on a backup disk to resume work quickly, successful copying and usable startup recovery are separate checks. The warning makes testing the intended recovery route particularly relevant before depending on it during an outage.
What remains unproven
The post says the issue was reported earlier; this is a current compatibility warning, not a newly discovered defect. It supplies neither an Apple repair timetable nor independent recovery-test results.
Read beyond this page.
Recorded source-check date: 15 Sep 2026. A link is not, by itself, evidence that every claim has been independently verified.
Changes & version history
Version 3 · 15 Sep 2026
Scheduled release of checksum-bound AI-assisted editorial review
Version 2 · 15 Sep 2026
Checksum-bound editorial review scheduled for release
Version 1 · 15 Sep 2026
Source-linked private review edition