What does Finder show for the size of your user data? Are you using iCloud data such as Photos, Music, Desktop and Documents?Hi there folks, I've clean installed Big Sur for the second time today, and noticed under the Macintosh HD - Data under Disk Utility says 100GB used... is this normal? Can anyone confirm this?
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du -sg ~/
The 16GB is the system volume. The other is the data volume. The two make up an APFS volume group. The user data, 3rd party applications, etc. are installed in the data volume.That's not a clean install. A fresh install of Big Sur is that 16.09GB volume. You've got 100GB of other user data that you can delete (maybe?) by deleting the leftover volume.
The 16GB is the system volume. The other is the data volume. The two make up an APFS volume group. The user data, 3rd party applications, etc. are installed in the data volume.
DS
Clearly OP doesn't know what a clean install means... First you need to erase your drive if you want to have a "clean install".
https://support.apple.com/HT208496
If you don't intend to erase everything on your system then you aren't doing a clean install and are justing re-installing the existing OS.
Installing macOS does not erase existing user data. So likely you have about 80GB of user data.