If I delete fortnite to move it to another drive will my islands be deleted?

I have Fortnite on a PC, if I were to purchase a gaming laptop at some point and want to be able to work on a map on both platforms depending where I am at so wondering would I have to copy the file from say PC and place it in the folder on laptop then after working on it do reverse and copy file from laptop and replace previous file on PC so like an over-write.

Is that the way it works or is there a better solution?
Thanks in advance for an info.