Using duplicity is almost as simple as using rsync, and it gives you incremental backups as well. And encryption if you need it. And can back up over SSH like Rsync, or to a local path, or even to Amazon S3.

[edit] I wrote up how I do this, with examples and cron entries a few months ago: https://grepular.com/Secure_Free_Incremental_and_Instant_Bac...

They don't want me switching away, but they should also recognize that programmers like me are lazy/smart enough that I'm much more likely to switch to their service if I know I can easily switch away.

(But being lazy, I'm not going to switch away from them on a whim. Even if the interface is the same, there's still a cost to the testing and such that would be needed. I mostly want to know that there would be a reasonable migration path.)

Joel Spolsky made this point about Excel once ("Strategy Letter III: Let Me Go Back!"): its adoption really took off once people could write 123 files.

That's an interesting point but I think it works more in favor of small providers trying to gain market share rather than incumbents.

Amazon's strategy with AWS seems to be to hype it so much that anybody who isn't using it feels like they are some sort of neanderthal since everyone talks about how everything is moving "to the cloud".

Interesting that he uses Excel as an example since I imagine (I haven't used Excel for a while) that saving data in a modern version of Excel makes it incompatible with anything else (at least it would do if OpenOffice didn't reverse engineer the format).

The format didn't need to be reversed, it's (almost) open. Additionally there are plugins for the older versions of Office to let them work with the newer format, and it's much much easier to write tools to do things with Word files now - just crack one open and take a look (it's a .zip file full of XML files).

Iris Couch's first blog post was about how to leave them for other providers http://www.iriscouch.com/blog/2011/05/how-to-bail-out-on-iri...

Well done.

It would also be nice not to have to use large install scripting languages (Perl, Python, Ruby), Java or Go, in order to communicate with AWS, e.g., EC2.

Let us be thankful for XML and the popular idea of "it's already done for you, just install this bloated library and read these 320 pages of documentation".

If API's mean you can't debug something without having to install Java or some huge, complex scripting language, I'm not sure they've simplifed anything. They've just added another layer of abstraction. More work should anything ever go wrong. And eventually, something always does go wrong.

Maybe S3 should just be rysnc servers running in Xen. Just cut to the chase.

Doesn't Google Storage for developers also have the same protocol as AWS S3?

And I heard there are ope-source S3 clones as well, e.g. http://www.pdl.cmu.edu/pWalrus/index.shtml#hdfs

Do you have an example of a stateful protocol you prefer over REST?

Depends on what you are doing, there are plenty of times where REST is fine.

What people seem to forget however is that there are other mature protocols on the internet besides HTTP.

Let's say for example you want to send some information between two servers. You decide to do this with REST, so you make an HTTP request. What happens if the REST server goes down?

You either want to failover to a different host or you want to it to wait and retry later. You could use some custom async queuing system like RabbitMQ etc but another thing to bear in mind is that postfix supports both of these things. You can simply send an email with your message to a target mailbox that the other server has access too and use multiple MX records for the failover.