What if i use Remnote desktop, and web at the same time

Remnote Desktop Store my Remnote database, on my computer. My question is if i login to web dose it will create another copy of my same data base or uses the same one.

if web will create copy, then lot of my computer space will waste if i have big database.

there will be no use. only syncing can be delayed unless you have high internet speed.
If you use local kb, then ur kb will not sync to the web version.