Question for crypto (as in cryptographic) nerds, I am looking for an automated solution for on-prem backups that encrypts said backup. The plan is to take said encrypted backup and store it off sight. Prefer open source, and for further context consider this "home lab" although it does involve multiple servers with public IPs etc. I do not want to have the encryption key easily reachable like in plaintext in a config file.
Right now this is all happening manually, but automated would make this so much easier. It does not have to be a full end-to-end solution, even just the encrypting part being able to be automated would be fine as I could simply script around it. Thoughts and recommendations?