When I do a snapshot, that file is part of the snapshot.  But are
changes within the file kept as well?

In other words, is it useful to have snapshots of a postgresql
database server?  If a database file uses 10% of the pool, and changes
20% between each snapshot, would the pool run out of space after 9
more snapshots?  Or would the pool continue to have 90% free space?
Or would only 70% or so free space?

Thanks!

-- 
http://www.glumbert.com/media/shift
http://www.youtube.com/watch?v=tGvHNNOLnCk
"This officer's men seem to follow him merely out of idle curiosity."
-- Sandhurst officer cadet evaluation.
"Securing an environment of Windows platforms from abuse - external or
internal - is akin to trying to install sprinklers in a fireworks
factory where smoking on the job is permitted."  -- Gene Spafford
learn french:  http://www.youtube.com/watch?v=30v_g83VHK4
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