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The problem is you need a Linux rsync server somewhere as the remote backup destination. It can be run over SSH, so backups are performed with encryption. Rsync can be run on Linux or Windows machines through Cygwin.

It efficiently transfers files over a network, and can be used to only transfer the parts of a file that have changed since the last sync. On the other hand, one of the simplest tools to backup files is a program called rsync, which has been around for a long time.

They may also put limits on the rate they upload your backups, change their cost, or even go out of business. For example, you are trusting their client app to do the right thing, and for your files to be stored securely in their data centers.

While these services may suffice for the majority of people, you may wish to take a little more control of your backup process. They usually require you to run one of their apps on your machine, which backs up your files periodically to their “cloud” of storage. They all provide various levels of backup services for little or no cost. There are several online backup services available, from Mozy to Carbonite to Dropbox.

An Amazon EBS volume holds your backup and is only attached during the rsync, though you could attach it to any other EC2 instance later for data retrieval, or snapshot it to S3 for point-in-time backup.

An Amazon EC2 instance is used as a temporary server inside Amazon’s data center to backup your files, and it is only running while you are actively performing the rsync.

Rsync efficiently mirrors your data to the cloud by only transmitting changed deltas, not entire files.

Uses rsync over ssh to securely backup your Windows machines to Amazon’s EC2 (Elastic Compute Cloud) cloud, with persistent storage provided by Amazon EBS (Elastic Block Store).

It’s available at GitHub for you to download or fork. I’ve created a small set of scripts that allows you to use Amazon Web Services to backup files to your own personal “cloud”.