┌───────────────────────────┐
  │                           │
  │    Disk QUOTAS in ext4    │
  │                           │
  └───────────────────────────┘


Install...
apt install quota quotatool


In /etc/fstab, add mount options of /home
usrquota

For example:
/dev/yourdevice		/home	ext4	defaults,noatime,usrquota		0	2



Debian 12 bookworm:
# reboot

make aquota.user:
# quotacheck -f -m -u /home




Debian 13 trixie:
# systemctl stop apache2 php8.4-fpm smbd nmbd proftpd

# umount /home
# tune2fs -O quota /dev/yourdevice
# systemctl daemon-reload

# reboot