<cffile> and MAKEUNIQUE

I am backing up a database at the end of each day and want to accumulate the backups - not overwrite the current database with the new one. The database name is OFFICE.mdb.
However, the overwrite is still operating and I do not get my accumulation . Office.mdb, Office_1.mdb, Office_2.mdb etc... (Note, I do not need to have the identifiers _1, _2 etc - any identifier which coldfusion wishes to use would be fine.)

I am using coldfusion 8 developer edition with windows XP.

Have attached the code.

Many thanks for any help

<cffile action = "copy"  nameconflict="MAKEUNIQUE"
source = "C:\ColdFusion8\wwwroot\office_11\database\office.mdb" 

destination = "G:\DATABASE_BACKUP\"
>

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