Backup before copy or javac ?

[Cyriaque Dupoirieux]

Hello,
  
   I have a problem that I can solve for days...

   I need to make a backup of the files that are replaced by a copy 
target or of the class files
that are replaced by a javac target.

   Is it possible with ant ?

   For instance if I have this directories :
       Codes/MyClass1.class
                 MyClass2.class
                 MyPackage.properties

       Src/MyClass2.java
             MyPackage.properties

    After the execution of ant I need to get this :
       Codes/MyClass1.class                        (not updated)
                 MyClass2.class                        (updated)
                 MyClass2.backup                     (Created)
                 MyPackage.properties               (updated)
                 MyPackage.properties.backup    (Created)

   Regards,

-- 
Cyriaque Dupoirieux
PCO Technologies
Burolines - 2 ter rue Marcel Doret
31700 Blagnac
T�l : 05 34 60 44 13 - Fax : 05 34 60 44 10