Hi,
If the dashboard is placed in the solution, you should delete it from solution and create a new one for yourself (not from customization, from Workplace > dashboards > New). If the dashboard is a personal one which you have shared, there is no need
to delete it. You could only remove the shared users from the sharing section of the dashboard.
BTW, there is no copy service in CRM, hence you could not copy your dashboard. You could create it manually.
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