How to get the size of the backed up datafile in a backup set with rman?

Oracle 10gR2 and catalog is in place.
Since RMAN only backups the used blocks(does not take backup from NEVER USED blocks), what can be the explanation of some extra space during backups?
And also how to trace this space allocation by datafile with v$% - rc_% views or any rman command?
Thank you, best regards.
Tonguç

Before 10G R2 rman does not backup never used blocks but it backs up blocks which have been previously used. So, dropping or truncating a table does not make the backup size smaller since the blocks of that segment are not "never used" anymore.
Starting with 10G R2 a new feature named "unused block compression" comes into play. With this feature rman does not backup unused blocks (even if they have been used before). But it has some restrictions like: you need to backup to disk unless you are using Oracle Secure Backup, the datafile needs to be locally managed, etc...
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14194/rcmsynta009.htm#RCMRF98765

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