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Parallel backup would be helpful if your USERS tablespace have multiple datafiles. If it has only one datafile the RMAN will not use parallelism and the file would be backup by single slave process.
To overcome this limitation RMAN has SECTION parameter which helps a single large datafile to be backed up in parallel. So if your datafile is of 100GB then SECTION SIZE 25G will cause RMAN to distribute the backup of each section (part or range of blocks of datafile) to different channels/slaves.