Differential SQL backups ? is this possible?

Hello, I am looking to backup one of our MS Sql databases offsite..
and because our databases are so large, and we do not want to consume
lots of bandwidth everynight during backups.. I was wondering:
Is it possible to backup only changes for a db?
thanks!
Lee
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Have a look at transaction log and differential backups in BOL.
Rgds,
Paul Ibison SQL Server MVP, www.replicationanswers.com
(recommended sql server 2000 replication book:
http://www.nwsu.com/0974973602p.html)