[Dump-users] Definition of dump levels?

[Scott E. <sc...@MI...>]

I've seen so many references to dump levels, but none of them, including 
the man page, actually says what, specifically, each level covers.

For example, a level 0 would presumably back up everything.  But will it 
still do so if I perform a level 0 today, update /etc/dumpdates, then 
perform another level 0 just after, and no files have changed?

What about the other levels?  What do they do?

Thanks.

Scott