Update: SuperDuper developer Dave Nanian reports that Apple has fixed the issue in macOS 15.3.One or more backup bugs in macOS 15.2 Sequoia is affecting Apples own Time Machine utility, as well as third-party apps SuperDuper and CarbonCopyCloner. Initially the problem appeared to affect bootable backups only, but it now appears that it is either more general than this, or there is more than one bug affecting Mac backups Things started with SuperDuperSuperDuper developer Shirt Pocket originally used its own code to create bootable backups of Mac volumes, before Apple locked things down so that developers had to use the companys own replicator functionality.After SuperDuper bootable backups began failing, the company investigated and found that the bug was in Apples replicator code in macOS 15.2.macOS 15.2 was released a few days ago, with a surprise. A terrible, awful surprise. Apple broke the replicator.Towards the end of replicating the Data volume, seemingly when its about to copy either Preboot or Recovery, it fails with a Resource Busy error. In the past, Resource Busy could be worked around by ensuring the system was kept awake. But this new bug means, on most systems, theres no fix. It just fails.Since Apple took away the ability for 3rd parties (eg, us) to copy the OS, and took on the responsibility themselves, its been up to them to ensure this functionality continues to work. And in that, theyve failed in macOS 15.2. Because this is their code, and were forced to rely on it to copy the OS, OS copying will not work until they fix it.Synology said that the same issue is impacting bootable backups to its NAS systems.Wider macOS 15 Sequoia backup bug(s)CarbonCopyCloner was also affected, which again normally supports bootable backups, but then users reported that (non-bootable) Time Machine backups were also failing.MacOS 15.2 breaks Time Machine backups. A friend had his entire backup history blown away by Time Machine.Can confirm. I use Time Machine to back up to a Western Digital drive and will (only occasionally) get an error about not all files being available and the backup will try again when the iMac is unlocked. View all commentsThe issue appears to be specific to Apple Silicon Macs.Weve reached out to Apple for comment, and will update with any response.Via Daring Fireball. Photo bySamsung MemoryonUnsplash.Add 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel