What is wrong with my backup script

[ringo747]

OK, here is the scenario. I have a NAS box which I backup a couple of machines to.

I use a script similar to this:

robocopy C:\Users\Me\Desktop\Stuff Z:\Stuff /MIR /ZB /R:3 /V /FP

On my laptop if I run the script is says that every single file is 'Older'. How can that possibly be? I maybe have changed a few files but there is no need for every single file on the NAS to be updated.

Is there any reason why the NAS thinks the files are older? Is it my script missing something?

If I run a script to backup from NAS to my PC it only updates the files that have changed and the status is 'Same' for most files.

Any ideas? I was wondering do files in the desktop folders get versioned or something which makes them appear newer?

Maybe the issue is with all PC to NAS transfers - maybe the NAS being on Linux has different timestamp/file versioning?

At a loss here.

Edit: I think adding the /FFT switch might be what I'm looking for.

Some third-party operating systems declare that their volumes are NTFS, but only implement FAT-style file times with a 2-second granularity. When copying to such a destination from a true NTFS volume, file time rounding may occur, along with unnecessary copying of file data in subsequent jobs. If you encounter this situation, you can use the /FFT (FAT File Times) switch to tell Robocopy to consider file times to be identical if they are within 2 seconds of each other, even though both source and destination appear to be NTFS. This eliminates unnecessary copying in this scenario.