When you delete a CRM element, it's not deleted irreversibly. It gets to the CRM Recycle Bin first. Here you can delete a CRM element permanently or recover it.
How it works
Click CRM > Recycle Bin.
Elements list contains all the information about deleted elements: ID, Name, element's type, when it has been deleted and who has deleted it.
You can filter elements by date, type, etc. For example, view leads deleted this week.
Any element can be deleted permanently or recovered.