Synology NAS Users Guide - Based on DSM 7.1
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...service is enabled. The NetBackup folder will be created when Synology Chat Server is installed. It is the default folder used to other DMA devices using Media Server. It contains files for a container. chat docker homes MailPlus music NetBackup photo surveillance usbshare video web web_packages... when Audio Station or Media Server is used to upload videos to Video Station or stream videos to store backup data of your Synology NAS. It contains home folders of installed third-party packages (e.g., phpMyAdmin). It contains domain data, spam reports, quarantine settings, etc...
...service is enabled. The NetBackup folder will be created when Synology Chat Server is installed. It is the default folder used to other DMA devices using Media Server. It contains files for a container. chat docker homes MailPlus music NetBackup photo surveillance usbshare video web web_packages... when Audio Station or Media Server is used to upload videos to Video Station or stream videos to store backup data of your Synology NAS. It contains home folders of installed third-party packages (e.g., phpMyAdmin). It contains domain data, spam reports, quarantine settings, etc...