Which are the times or conditions TSM will take backup

Based on the 4 key features of the files, TSM application will decide whether the file needs to be backed up or not

   MODified
      Specifies that Tivoli Storage Manager backs up the file only if it
      has changed since the last backup. Tivoli Storage Manager
      considers a file changed if any of the following is true:
      *  The date last modified is different
      *  The file size is different
      *  The file owner is different
      *  The file permissions are different