Copy part of SVN repo to new repo?

Question

Currently, I have a large SVN repository with a bunch of different projects within it, as follows:

/
 Project1/
          trunk/
          tags/
          branches/
 Project2/
          trunk/
          tags/
          branches/
 Project3/ 
          (etc...)

However, I'm now trying to break it up into separate repositories (for various reasons), and I would like the following for each project:

/
 trunk/
 tags/
 branches/

If possible, all history and externals should remain intact. However, I'm unsure if this can actually be done. I have seen several questions similar to this on SO but none entirely addresses the issue I have here. Basically I am trying to "pull out" a subdirectory and its entire contents with history from the old repository and plop the whole lot into its own (new) repository.

Am I asking the impossible?

Answer 1

Use

svnadmin dump path/to/repository > repo.dmp

and then use svndumpfilter to only load a subtree into a new repository.

Answer 2

Since SVN 1.7 you could use

svnrdump dump path/to/repository > dump

to get the dump. While Stefans solution works, it does require access to the server hostig the repo. svnrdump works over the net with any repo you can read from.