worked for a guy

Probably some variation of owner/boss/CEO.

On my desktop, I have about 200GB free, which is about 10%, which feels like the bare minimum, and the only reason I haven’t upgraded yet is that there’s some large directories I can archive should it be necessary.

On my server, I recently was down to about 500GB free, also about 10%, which made me add more drives.

So it’s all relative.