Does it make sense to buy USD Treasury Bonds ETF & TIPS?

Hi Cheryl, yes purchasing a UCITS ETF for US High Quality Bonds and Inflation Protected bonds can be a good idea.

But when investing in bonds, I'd suggest using an active bond fund instead of a passive bond index tracker. Here's an article that explains why this might be a better option. https://www.etf.com/etf-education-center/etf-ba...

Also, I'd expand to a global allocation instead of just US alone. An example of such a fund would be Dimensional Short Fixed Income Fund with a lower TER than the ones you mentioned.