Jedmeister, 

thank you for your answer. My small EC2 instance ( through the hub) is an S3-backed one, unfortunately. 

I am using a zimbra instance, it has not got Postgres but it is still unsupported by tklbam. It is spelled out plain and simple in the faq and it is all fair play but I still need to find an easy way to back it up. I don't see how I could attach an ebs volume, should I migrate my instance to the aws console? If so, is there a howto on that?

Again, thank you very much for your help.