May be I don't understand you but I agree with Charles-Tim here. The seeds are what the OP needs to take care.
LoyceV is right. You should keep the master public keys too.
If you have a 2 of 3 multi-signature wallet and you have two of seed phrases and nothing else, you won't be able to restore your wallet.
As I said in my previous post, if you have seed phrases A and B, you will need the master public key that is derived from the seed phrase C too.