Red Alert for Apple Installations: Be Aware of Data Loss When Upgrading to macOS Big Sur

When upgrading to the latest version of macOS Big Sur, Apple's FileVault feature provides an added layer of security by encrypting your files. However, this encryption can make it extremely difficult to recover your data without a backup in case something goes wrong during the upgrade process.

If you're planning to upgrade your Mac to macOS Big Sur, it's crucial to ensure that you have enough storage space available on your device. According to Apple, upgrading to macOS Big Sur for the first time requires at least 35.5 GB of available storage - and this doesn't include the 13 GB installer.

Unfortunately, Macintosh found out that the macOS Big Sur installer does not check whether the Mac's internal storage has enough free space. This means that even if your Mac does not have 35.5 GB of storage available, it will still try to install the update - which can result in data loss.

During the upgrade process, your Mac may become unresponsive, and data can be permanently corrupted. In some cases, users may receive an error message saying 'An error occurred preparing the software update' near the end of the installation, only to find that their Mac will no longer boot afterwards.

To avoid this issue, it's essential to have a backup of your data before upgrading to macOS Big Sur. If you don't have a backup, recovering your files can be extremely difficult, and may require connecting your Mac to another Mac via Target Disk Mode.

In summary, Apple's latest operating system update has a serious issue that can result in data loss when users try to upgrade their Macs without enough space available. To avoid this problem, make sure you have at least 35.5 GB of storage available on your device before upgrading to macOS Big Sur.

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