The most critical aspect is maintaining the relative path structure. FTP clients rely on specific folder hierarchies. If the repack flattens the folders (removing sub-directories), the organizational logic of the movie zone is destroyed. The repacking process must archive the root folder structure exactly as it stood on the original server.
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Note: Always use a VPN and updated antivirus software when accessing public or semi-private FTP directories. How to Setup a WoW Repack (The Quick Start) wow movie zone ftp server repack