@Jonny22 sure water is a problem. so is fire and lots of other things.
However, when you use Shamir Backup, this adds 2 advantages above the single passphrase method.
- when 1 of the 10 is found by a bad boy, they still dont get access. (since you can set to need 5 out of 10).
- when you lose 2 because of water (or just can’t find them anymore) you still have 8 other pieces, 5 of which are still enough. So you can also spread you code at various locations.