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Forum Discussion
Backup job copies ALL files instead only changes
I have a ReadyNAS NVX running 4.2.26. It has a share used for our ESXi server backups. I then have a ReadyNAS backup job that runs everyday and copies the backups from the NVX share to a USB drive a...
Robocopy is my go-to copy app because it's one of the few that accurately copies all file attributes, and even works on folder timestamps, which virtually every other copy program neglects. It has an /FFT switch with 2 second granularity.
However, robocopy has similar issues with timestamps. Without /FFT, older versions checked and copied to millisecond granularity, while newer versions copy full NTFS granularity, resulting in the same problem as above. Stupid, but even so, it's rarely encountered because it requires comparing the same files with different versions of robocopy (i.e., different OS), unlike the above which fails on the same machine repeating the exact same operation.
However, robocopy has similar issues with timestamps. Without /FFT, older versions checked and copied to millisecond granularity, while newer versions copy full NTFS granularity, resulting in the same problem as above. Stupid, but even so, it's rarely encountered because it requires comparing the same files with different versions of robocopy (i.e., different OS), unlike the above which fails on the same machine repeating the exact same operation.
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