If your original 2.5 site was installed correctly, the only things you should need to do is
1. copy everything from the main joomla directory on the old server to the new one. 2. Create a database for the new site and import the data. 3. connect the site to the data base in the configuration.php file.
Following the prompts should restore it, but sometimes you have problems with the data base connection. Read their documentation.
If you still have access to the original site, it's good to make a separate backup profile and backup just the data base, or use phpmyadmin to export the original database and use it to restore the databbase using phpmyadim on the new site.
Akeeba can be confusing when going between servers. They have frequent updates. You might want to check with them as well in case this is cause by a known issue and they have a ready answer. Here's the link to their restore forum www.akeebabackup.com/support/site-restoration.html
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Move a Joomla 2.5 site to a new Domian Name 1 year 1 week ago #45947