https://wccftech.com/macos-big-sur-update-results-loss-of-data/

Apple’s macOS Big Sur officially arrived in November of last year. Since then, the company has released several updates catering to bug fixes and focus on improving the operating system. However, if you’re running low on space, then we caution you to free some of it on your Mac because if you don’t, it might result in data loss while installing the latest update.

According to Apple’s support page, the company has mentioned that its macOS Big Sur update requires 35.5GB of free space available on macOS Sierra or later. However, if the available space on your Mac is less than that, you can potentially become a victim of data loss, according to a report from Mr. Macintosh.