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macOS Big Sur upgrade reportedly causing data loss if low on drive space – TechRadar
Installer fails to check available drive space before taking the plunge

Mac owners who are upgrading to macOS Big Sur should be very careful if they are running low on drive space, as in this case, the process could reportedly lead to data loss.
The issue here is that an initial upgrade to Big Sur requires a minimum of 35.5GB to be available on the drive, plus 13GB for the macOS Big Sur installer itself (making 48.5GB in total). If you dont have that much space, then things can go badly wrong, as reported by Mr Macintosh.
The problem is that apparently macOS doesnt…
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