just encrypt your btc keys with another secret key(symmetric key e.g. aes, blowfish or something else). Store them on different cloud providers, encrypted btc keys on google drive and the other secret key (password protect it) then store it on one drive or icloud or private repository on github. The hacker must hack both sites to take your keys(very unlikely to succeed) and they are both securely stored online. Also make sure you're not using the same password for both sites :)