Files With Changed Permissions Not Incrementally Backed Up

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Windows NT keeps track of three time stamps associated with files and directories. These three time stamps are creation, last access, and last written. When a file or directory is created, accessed or changed, Windows NT updates the appropriate time stamp. These time stamps can be viewed by performing a DIR command using a /T switch to view the desired time stamp.

For example, the following lists the different types of DIR /T commands you can use:

   DIR /TC <file or dir.>   Displays the creation time.
   DIR /TA <file or dir.>   Displays the last access time.
   DIR /TW <file or dir.>   Displays the last written time.
				

If the last written time stamp of a file changes, the archive bit is set. This allows NTBACKUP.EXE to perform incremental backups based on when the file has last changed.