Your Bitcoin private key can be separated into two parts:
1. Seed words (backed up on one plate)
2. Passphrase (on another plate)
NB. Store both parts in separate locations, because no-one can access the wallet without access to both parts of the key.
http://www.bitplates.com
So in this case you will double the chances of losing money.
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Not if you have multiple backups.
eg. Seed words in 3-5 separate locations
Passphrase in 3-5 separate locations
If any one is discovered, they can't be used to access the wallet.
