What do you guys think of putting money into US treasury/ bonds?

Is it safe? and my timeline is basically 2-3 years, afterwhich I would need the money. I already invest in stock market but didn't want to use this money, since market might go down/up in that timeframe. Also i currently use CapitalOne HYSA which has decreased substantially and is only around: 3% flat. Please someone knowledge give me insights on it

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