** fall back backups

Hi,
  Now that clocks have been set back one hour (in us of a etc), it is time to 
bounce the databases. Since Oracle says it needs to be done (read some analyst 
in a TAR said it).
Is it for backups? I agree time based recovery to a point in time could lead to 
issues. However, will it affect the regular recovery until cancel which I think 
goes by SCN/log #. Please correct me if I am wrong. 
Also once you have a couple of backups after the fall back resetting of clock 
is it still necessary to bounce databases and immediately take 2 backups?
  Apart from backups does setting the clock back affect anything else on the 
database? Thanks

                
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