Here's the modified reply:
We support Partial backups via scripting. Simply add the @read_write_filegroups parameter to the backup statement.
For example:
execmaster..xp_backup_database @database='foo', @filename='c:\foo.bkp', @read_write_filegroups=1
You could also have a look at Fast Compression as it will only back up database changes using differential backups, preventing the redundant backup of unchanged data.
Thanks.
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David