Moses,
Many of the answers here come from a general
understanding of SQL Server backup/restore strategy.
Here is some very good reading material for you:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/adminsql/ad_bkprst_4l83.asp
As far as a Data Protection for SQL impact, you mentioned
the main ones, i.e. storage and network bandwidth savings
by using a full + differential strategy.
Also, depending how the data is stored, i.e. on tapes or disk
and how many stripes you use for backup, would have a
determination of how many tape mounts you might require
for a restore operation.
Thanks,
Del
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