$ du -hx -d 1 /
This command tells du to start in the root folder, do down 1 folder deep (-d 1), and give out stats in "human readable" form (-h) and to not traverse mounted file systems (-x). In a nutshell, it tells you which folders are taking up the most space on your root partition, something that is real nice to know.
FreeBSD Hypertext Man Pages: du
I haven't run into disk space problems, but your solution of an automatic email sounds like a great idea, just to stay ahead of the flow.
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