Here is a postulate: YOU CAN'T DO A COLD BACKUP OF A 10.2.0.4 Std. Ed. RAC DATABASE
Think about it.
What can be said for the afirmitive?
What can be said for the negative?
Remember: A Std. Ed. RAC database has a CRS, +ASM1, +ASM2, plus two database instances. The database files can't be seen from the OS, as they are 'hidden' away in the devices configured for ASM.