Minio is an open source object storage server with Amazon S3 compatible API. Build cloud-native applications portable across all major public and private clouds.
Joyent's Proven Cloud Computing Infrastructure and sophisticated Cloud Hosting Technology enable you to enjoy Virtual Servers with advanced Cloud Security.
Duplicity is a backup program that only backs up the files (and parts of files) that have been modified since the last backup. Built on FLOSS (rsync, GnuPG, tar, and rdiff), it allows efficient, locally encrypted, remote backups.
With the new version of OS X (Leopard) Apple has included some great functionality in Time Machine. Your Mac will automatically backup to an external drive every hour. It includes the ability to recover deleted files in a timeline.