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WebHMI ships with builtin FTP server. It allow users to get access to data on SD card remotely. So you can download SQLite databases with collected data, use SD card as file archive or perform any required maintenance (delete some files, etc).
By default FTP server is enabled. Starting from WebHMI version 3.3 you can disable FTP server on Setup → Settings page on Services tab.
The default settings for the FTP server are the same as for network settings, namely: