[lug] Tape backup app

[B Giles]

>Hmm...news to me.  So how do other backup solutions address this problem?

As Sean mentioned, databases should be backed up via their own tools.  This 
isn't a big issue if your database is stored on its own partition and your 
tools don't cross partition borders.

For the regular filesystem, anything that goes through the mounted FS is 
probably safe since you'll see the kernel pages.  The main thing there is to 
avoid files being updated, and for that my tool (always a few months away 
from release :-) requires an advisory read lock.  These files can be handled 
separately, if necessary.

The main advantage to dump is that it understands things that the OS or 
backup tool may not understand.  Dump/restore should handle extended 
attributes and ACLs, while tar won't.

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