Folder sizes differ within two copied NTFS file trees (using ntfs-3g)

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http://serverfault.com – I have a NTFS partition, that I previously used with a Windows machine. I installed ntfs-3g as a filesystem driver in CentOS, then mounted the drive. I copy the contents (cp) to a different NTFS partition, also mounted. Now, using ll, I can see between the source and destination that some folders are 0 whereas the same folder on the other partition is (usually) 4096 bytes. I never understood 'folder sizes'. Why does a folder have a size? And what do I lose if ls -l reports to me that the folder sizes are different between a source and a backup (but files and file contents are without differe (HowTos)