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Bond ETFs vs actual bonds
ETFs are just like any other mutual fund; they hold a mix of assets described by their prospectus. If that mix fits your needs for diversification and the costs of buying/selling/holding are low, it's as worth considering as a traditional fund with the same mix. A bond fund will hold a mixture of bonds. Whether that mix is sufficiently diversified for you, or whether you want a different fund or a mix of funds, is a judgement call. I want my money to take care of itself for the most part, so most of the bond portion is in a low-fee Total Bond Market Index fund (which tries to match the performance of bonds in general). That could as easily be an ETF, but happens not to be.