gzip'ing rman backups

Hi folks,
I want to gzip up my rman backups, which are to disk. I do a full at the weekend, and archive logs daily. I know that rman cant cope with zipped files, and I will have to unzip them myself before attempting a restore. My question is - does rman ever check existing backup files - will it look for the last full backup before backing up todays archive logs etc - or once backed up, does it ignore backup files until I ask for a restore?

My databases's are OLTP, with a datafile | tablespace containing each days partitions. Apart from system, rbs there are only transaction tablespaces
(one per day) in the database. Assuming I can switch each transaction table
to read only at end of day, back it up as a datafile using rman, and back up rbs & system, then I can can discard all archive logs for that day - right? So a typical scenario will have 14 datafiles backed up (the DB keeps 2 weeks data), each with RBS & system from that day, and archivelogs for the last day only for PIT recovery. Im about to spend a few days testing this out - anyone know if it will work/fail?

Thanks
Mark Teehan
Singapore.

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