1. A method for synchronizing metadata between servers when metadata structure of these servers deviate, wherein synchronizing comprises copying data from a source server to a target server, wherein said data is associated with a metadata having a set of properties, a property comprising a property name and a property value, the method comprising: mapping the metadata from the source server to a metadata structure of the target server, where the mapping comprises determining aliases for property names being comprised in the metadata, wherein an alias defines a general concept for a property in question; determining if the metadata structure of the target server comprises property names having the same aliases; and if so, copying data with such properties of the associated metadata from the source server that have matching aliases in the metadata structure of the target server.