Hi,
When you login in a tenant in a system, SDK downloads a local copy.
Lets say you make a change from one system for a solution and logins from another system to check the change means you need to refresh the solution or download the solution again by clearing your local copy.
Local copy is downloaded in \Documents\CopernicusIsolatedShell
Best practice is when you are going to make any change or made any change, load the solution from server always to avoid erasing your own code.
Thanks,
Ajith J.