Incremental backup services with change only charges?

Question

I'm looking for online backup services that provide incremental, change-only backups.

I'm looking to transfer as little data as possible and would like to find a service that provides full backups every week along with incremental backups every day.

Are there any specialist companies that deal with this or do I just use standard backup ones?

Any recommendation appreciated.

To expand on this Im looking for software/services which work on Unix. I guess Linux is fine aswell as FreeBSDs Linux compatibility layer should run it.

Oh and command line would be ideal and not require the use of X Window.

Thanks.

Answer 1

i like crashplan. it does compressed incremental backups.

Answer 2

You might use Amazon Simple Storage Service (Amazon S3), where it says:

Pay only for what you use. There is no minimum fee.

There are many possible combinations of S3 with backup products, both free and commercial.
The following article may serve as an example:
Duplicity + Amazon S3 = incremental encrypted remote backup

Answer 3

Have you looked at mozy-Home?

Also, this was answered here before. (3 links)

For Linux, take a look at Jungledisk.

Answer 4

If you're Canadian the following service isn't available for you :-(

Tarsnap is a secure online backup service for BSD, Linux, OS X, Solaris, Cygwin, and can probably be compiled on many other UNIX-like operating systems. The tarsnap client code provides a flexible and powerful command-line interface which can be used directly or via shell scripts.

Quoting from its design page:

Efficiency: Backups should be efficient, using a minimal amount of storage and bandwidth. If you archive the same file twice, it should still only be uploaded and stored once; likewise, if you move, rename, copy, or make small changes to a file (e.g., adding a small amount of new data to the end of a log file or mail spool) you should never need to re-upload the entire file.