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Would need more information. Can you post the backup script and version of Oracle?
Compression is you first option. If you don't have advanced Compression, you could compression the backup yourself. Keep in mind this will slow recovery time.
BACKUP AS COMPRESSED BACKUPSET
So use BZIP2 instead of ZLIB if you can.
SELECT ALGORITHM_NAME, ALGORITHM_DESCRIPTION, IS_DEFAULT FROM V$RMAN_COMPRESSION_ALGORITHM;
What was the exact BACKUP command ?
How did you determine the size of the Backup ?
Hemant K Chitale