I used a usb-c external SSD drive. Worked like a charm and I even could run starcitizen from that with no remarkable performance drop. Once I was settled with linux I just installed the external SSD internally.

I use backrest selfhostet on my server running yunohost. It is pretty much set and forget. I love it.

German Linux Magazin from 2005.

Plain and simple: yes.

If you can install Windows and Linux in separate harddrives / SSD. That makes live easier compared to duelboot from the same harddrive.

For some time I had Linux on a USB-C ssd. I even run starcitizen from that without much problems. After some time i just installed the external SSD as second hardrive.