RMAN-08443
Skipping archived logs of thread string from sequence string to string. Already backed up or it has redo not required at Recovery Appliance.
Cause
Some archived logs are not backed up because they are already backed up on the device requested or they have redo not required at Recovery Appliance.
Action
No action is required. You can use the FORCE option to override backup optimization and force these files to be backed up.