A few minutes ago I accidentally deleted my backbone switch (and all the interfaces of course). Since undeleting an element (node, interface etc.) is not possible (Except restoring SQL from backup) it means that I've lost all the interface statistics, node statistics (CPU, Memory, Availability) and atlas map drawing. And this is not my first time. This is a common issue for all of us. If NPM can remember an element for a specific period of time that would be great. I think It shouldn't be that hard to implement this.
PS; Please vote these ideas also if you like them of course. And I bet you do.