I have been using a key pair at home with gpg command line tool on Ubuntu, to encrypt password text files for a few years now. I no longer have any record of the type of encryption and bit length used when I created the keys so I would like to identify it and decide whether the encryption is strong enough for the next step, or whether I should create a stronger key pair and re-encrypt a bunch of files which I'd like to avoid.
The next step would be uploading the key pair as well as all passworded files to cloud hosting, probably Google Drive. I assume that the cloud hosting may not be fully trust worthy and I need to maintain high encryption. Given that requirement, is a long passphrase (over 32 chars) enough to secure the private key?