I saved my Master Key using Paper RAID 5:
- splitting the Key into 3 Parts
- Write 3 Papers: one with part I and II, one with part I and III and one with part II and III
- Store these papers at different, secure locations
It has two benefits compared to the normal cold storage:
-If somebody finds one of these papers he can't log into your account
-If one of the papers gets lost or destroyed your password is still save