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I think you are need to know you database requirements and snapmanager posibilities.
but in order:
now you have separate datafile, controlfile, redologs on separate voldrives,
if you are doing snapshot you need to take all these oracle files in one moment, or use database suspend comand ( i think you need to do test how you database snapshot will work better).
about redundant redologs per group its redundant feature .
about flasback feature if you have flasback you can fix user error (like drom, update) without doing restore of whole datbase restore.