big sur – How to setup Disk Quotas on macOS Big Sur?

You would need to install quota-tools from Homebrew and then use that to configure your disk quotas.

Install Homebrew (if you haven’t done so already)

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Then install quota-tools.

brew install quota-tools

Afterwards edit your /etc/fstab to enable disk quotas for the file sytem

/dev/rdisk0 /home apfs defaults,usrquota 0 2

Then run edquota to add disk quotas for the individual users:

sudo edquota -p user1 user2

After that restart the system to have the disk remounted and disk quota to take effect.