I want to backup my data to the cloud. Before that, I want to encrypt it using GPG (
gpg (GnuPG) 2.2.11 and
- The backup is just for me, so I don't care about interoperability
- I only care about how secure it is, especially in long-term, thinking about Quantum computers etc. (assuming the risk that data that was once uploaded, could be kept - even though it's deleted from a end user perspective - and might be decrypted later).
Which algorithm should I use in this case? ECCs? Which one? Does it make sense to double encrypt, e.g. first use RSA, then an ECC algorithm?
Update: I understand that there is likely no solution that will be safe forever, as time might bring more computation power. But from today's view, which algorithm would be the most promising one to be broken as last one?