Tails is a live system designed to preserve your privacy and anonymity. You can install or run Tails directly from the USB alongside Windows or run it live on most of Apple mac computers. Specifically for Linux Tails, persistent mode contradicts the anonymous approach/no data trace left behind idea, so by default, it is setup without persistence mode availability (it's literally greyed out), as even though local persistent data is encrypted - it can still be accessed.
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