Could be nice to have a move projects function. I'm using this software to manage an italian site. Now I'm reconfiguring it to manage all other sites. I've tried to copy my projects layout, but it copies alla the issues and assign a new date. I think that is better to mantain the original dates because it's usefull for ticketing reorder.
Updated by Holger Just over 13 years ago
Luca, there is a plugin written by Eric Davis for merging two instances of redmine: http://github.com/edavis10/redmine_merge_redmine/ It might solve your issue.
You will not be able to maintain all ids if you move data between installations, as these ids have to be unique.