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Camper | 21 hours ago (raw) | root | parent | reply | flag +1 
 - Did you generate the seed on a single device?
- Can you prevent hurricanes, floods, fires, ...?
- Can governments prevent you to access the location in cases of (indefinitely long) emergencies?
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repletesumo | 21 hours ago (raw) | root | parent | reply | flag +1 
 Everything has tradeoffs. For long term storage, your first two points aren't applicable. 

1. You can do it offline and bring your own entropy
2. Most weather can't get through a block of concrete
3. This is valid risk and needs to be mitigated.
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Camper | 19 hours ago (raw) | root | parent | reply | flag 
 Fair point with the key generation.

With the single location, I wouldn't be comfy when I need to be.

Think about being in 1900 in Europe and trying to find a single secure location where your kids would always be able to access it in time of need for just a next 100 years...

Probably more than 95% of land mass or fakilies had some heavy access restrictions put place on them at least for some period during that time. Usually in the most crucial period.