Appendix Hardlinks On Unix-based systems, it's possible to encounter multiple files with the same inode. The most common case of this is a hardlink. Aspera Sync is agnostic as to whether two files with multiple inodes are hardlinks or if they are actually different. It assumes that directories have unique inodes. Creating SSH Keys Public key authentication (SSH Key) is a more secure alternative to password authentication that allows users to avoid entering or storing a password, or sending it over the network. Public key authentication uses the client computer to generate the key-pair (a public key and a private key). The public key is then provided to the remote computer's administrator to be installed on that machine. rsync vs. async Uni-directional Example The async and rsync command-line options are similar for basic uni-direction synchronization.