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What is TOS? Why does my TNAS device need TOS?

"TOS" stands for "TerraMaster Operating System”, which is a Linux-based operating system especially developed for TNAS storage devices. TOS is designed with a smart and user-friendly interface. The numerous built-in applications help households, offices, or enterprises easily implement features such as storage management, secure backup, permission management, multimedia entertainment, sharing, remote access, and downloading.