Use a pull based one instead of a push based one. My backup system involves my data storage system reaching out to each machine I want to backup and fetching t

Use a pull based one instead of a push based one. My backup system involves my data storage system reaching out to each machine I want to backup and fetching the data locally. All I need for that is to put my storage system's public key on the machines, and I'm fine with an attacker getting that.