rman redundancy policy

hi all ,

i have a question concernig the recovery manager .
i am new to rman, while i was checking the configuration of rman i noticed that the retention policy is set to redundancy 1 .
if i changethe retention policy to 6 ,what will happen to the backup copies that are within the redundant window .
are they expired or jsut after i changed the redundancy level i can use them for resotore


cheers

thanks in adcance

They remain unless you do a DELETE OBSOLETE.

You should reference the RMAN User's Guide.