Sub CREATION_BACKUP_CASSE()
Dim M4, M19, M18 As String
M4 = Sheets("MACRO").Range("M37").Value
M19 = Sheets("MACRO").Range("M52").Value
M18 = Sheets("MACRO").Range("M51").Value
If ExisteFichier(M19) Then MsgBox "/!\ ATTENTION /!\" & vbNewLine & vbNewLine & M18 & vbNewLine & vbNewLine & " LE BACKUP EXISTE DEJA !!!": Exit Sub
FileCopy M4, M19
End Sub