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How can I predict how much data a backup will save to tape?

Scripting

How can I predict how much data a backup will save to tape?

by  mgdaviso  Posted    (Edited  )
UNIX:Copy this into a file called "estimate"

savegrp -EnG "$*"

then make it executable, and use this. This will run down the filesystems twice and give an ESTIMATE of how much data it would back up if it ran at that point
This does not back anything up.

eg: estimate daily_full_group
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