Jim,

I've been testing it myself.  I think you do need to keep that full backup 
around.  The "synthetic" part of a synthetic backup is the consolidation of the 
full backup and the incrementals into a single image.  This is done via 
duplication.

The test scenario I'm working with is the following:
Full backup taken every 4 weeks and kept for 2 months
Incremental every night kept for 2 months
Synthetic full every week which is kept for 1 month (offsite retention only)

This seems to be working fine.  I see a "full" backup during in the backup 
image list for the test client.  I've not actually trying doing a restore of 
this "full" backup to see what tapes are loaded and how long it will take.


> I have a bit of an oddity.
> 
> I'm testing Synthetic Backups.
> 
> I have
> 
> Day 1 Full backup. Day 2 Incremental
> Day 3 Synthetic-Full Day 4 Incremental (and manually expire the Day 1 Full) 
> Day 5 Full backup runs
> 
> So it appears I need to keep the Full backup around even though the Synthetic 
> Full is suppose to be its equivalent.
> 
> The Full backup runs on Day 5 even though I don't have it scheduled. In Fact 
> Full are manual. Synthetics are scheduled.
> 
> Is this normal?
> 
> Running 6.5.4 


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