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PSA: Mac OS 15.2 breaks Time Machine backups. A friend had his entire backup history blown away by Time Machine. If backups are important to you, wait for 15.2.1 or beyond.

SuperDuper and CarbonCopyCloner are similarly affected. Just avoid the update if you can. If you’ve already updated, disconnect your backup disk so it doesn’t get clobbered. #macOS #Apple

https://www.macrumors.com/2024/12/17/macos-15-2-breaks-superduper-bootable-backups/