Move root mail file to the backup locationcp /var/mail/root /var/mail/root.backup
create an empty file on this same placecat /dev/null > /var/mail/root
You can still read the old one by this commandmailx -u root.backup
Get that main directory had the biggest sizesudo du -h --max-depth=1 /
Once you know you can look inside the folders to know the in-depth locationsudo du -h /var/ | sort -rh | head -5
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