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macOS Monterey beta bug could affect Time Machine backups

Tuesday July 27, 2021. 11:00 AM , from Mac 911
Have you recently seen the message “The file ‘%@’ could not be backed up” after Time Machine warned you of a failure? You’re not alone: many people who have installed the macOS 12 Monterey Public Beta have also received the same error. There’s no fix for it; it’s likely an error in how Time Machine scans for files.

This failure appears related to a recent update to the macOS 12 Monterey public beta.

This may mean your files are not properly being back up, however. I entered Time Machine on a Mac that’s running this public beta and looked around through older backups even where Time Machine claims it hasn’t been updated. The files all appear to be there, but I can’t check comprehensively.

If you’re concerned about losing data during this test period before Apple squashes this bug in a future beta or production release of Monterey, make sure all your document files are stored on a syncing service, like iCloud Drive or Dropbox, or syncing through iCloud services. It might be a good time to make nightly clones of your computer with Carbon Copy Cloner and enable in Carbon Copy Cloner > Preferences > Updates the option “Inform me of beta releases.”

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https://www.macworld.com/article/351893/does-time-machine-tell-you-the-file-cant-be-backed-up-its-a-...
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