I wrote my own backup script that runs every day to copy files from my main drive to a 2nd 500 GB HD.
Its mostly a lot of xcopy commands. For my pictures, the command is below (btw, I run that from the root of the "My Pictures folder")
If I do a right-click on the folder "Pictures" I get the exact same size if I went to the actual "My Pictures" folder on my C drive.
In the above picture, my source is on the left, and my backup is on the right.
What should match is the number of files / folders, and the Size.
"Size on Disk" may be different, depending on a few factors, including fragmentation level, and if you have compression turned on or not.
For me, I know my xcopy command won't copy the "Protected operating system files", like "Desktop.ini" and "thumbs.db". If a number of them are present on your source drive, they may not be copied to your destination drive / media, which could result in a difference in total files and size.
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