Stranded deep base

I’m not very sure so does saving the game on a different island instead of the previous main island base remove everything on the main base or am I just at the wrong island I’m kinda new to the game still I’m also on pc

Your island are all set (Its seeded like minecraft is) So you can save where you want, your stuff will stay on other islands.

Custom Islands have a few oddites. (PC does abit better with them)