How to move DokuWiki from one Server to another?

The simplest way to do this is to just copy the whole DokuWiki directory to the new server.

Here are a few things that might cause some trouble:

Last modified dates (filemtime) may change when just copying your files. To avoid this, pack the whole directory in a TGZ file, transfer it and unpack it on the other server.
basedir and baseurl options might have to be adjusted.
The cache might need to be updated. See caching for info about how to do that.
Permissions and fmode and dmode may need tweaking.
Your .htaccess might need to be tweaked, especially when using URL rewriting
You should upgrade after transferring the data.

Transitions between different operating systems should not cause any trouble, DokuWiki does not care for OS specifics.

See also