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Make sure the client supports different types of protocols.Others support connection to third-party storage servers like Dropbox and Google Drive. Some of them can only transfer from local servers to online servers. Check which clients are connecting to certain types of servers.FTP client should also support the ability to pause file transfer and resume it when needed.Support for parallel downloading or queuing of the files.The best OS X FTP client has bookmarks and search tools for your files.Security should be on the top of the list when choosing an FTP client.
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