Backup copying data files

I've heard some people perform backups of their databases by just saving to tape the database files (.ORA files). Of course the previous step is to stop database service.
I usually export my schemas and then backup the .DMP files. Sometimes export of large databases can take long so my question is, what are you missing saving the database files (I mean not exporting schemas) ???

Neither method is a "real" backup from the standpoint that it is more likely to fail and more likely to be incomplete than doing it the right way:RMAN
Read the RMAN docs at http://tahiti.oracle.com
I think these days most employers, I know it is true for myself, will not hire anyone that does not consider RMAN the only way to create a backup.

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