You need to very careful with address reuse using your set up. Whenever you spend from an address, then the three individual public keys for that address are revealed in the transaction data. If someone was to then compromise a single one of your paired back ups, they would have all the information required to spend any other coins on that address.

I'd also be quite uncomfortable about the wallet files on your PC, depending on your set up. If your wallet files are simply on an online computer then that is not very safe, since you are relying on the secrecy of your wallet descriptor/public keys not to reduce an attacker to only needing 1-of-3 of your back ups to compromise your wallet.