I have several backup servers that run the excellent rsnapshot software, which uses Secure Shell (SSH) for remote access. The SSH private key of the backup server can be a weak link in the overall security. To see how it can be a problem, consider if someone breaks into your backup server and manages to copy your SSH private key, they will now have the ability to login to all machines that you take backups off (and that should be all of your machines, right?). The traditional way to mitigate SSH
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