I have two Ubuntu servers, both of which have SSH access available. One server is a publicly accessible server. I have it segragated fairly well on the network from LAN machines. This public server only allows SSH connections using a public/private key pair. Normally, I connect to the machine with a Windows computer using Putty. Putty is configured on this computer to login with the private key. However, I now added the second server to the network. I would like to be able to SSH from that server into the first public server. I want to be able to use SSHFS to mount drives and so forth, mainly for transferring files and performing backups. How do I configure the second server with the appropriate private key (the one I currently use with Putty) so that the first server accepts the login credentials? (As a side note, I would be open to comments on my backup solution. I already have an external HD mounted on the public server. I was thinking of using SSFS to mount the folder where the external HD is mounted on the first machine to the second machine. I would then write my backups from the second server to the external HD through SSHFS.) Thanks.