Hi dms --
unless you've made radical changes to the servlet container running XTF, I would guess that you could do something along the lines of the following:
1. copy your xtf-instance.war and your xtf-instance directory to a new servlet container
2. start that servlet container
I'm making a couple of assumptions here, namely that you have access to the Windows server that is running your XTF instance and that all of your finding aid data is inside XTF. If you don't have 100s of gigabytes of finding aids, you could test the above locally; e.g.
1. download and install Apache Tomcat
2. copy your xtf-instance.war and xtf-instance directory to the $tomcat/webapps directory
3. start that local version of $tomcat
4. index your files locally
5. visit localhost:8080/xtf-instance/search and verify that your instance is working as expected....
I'm not sure if this is canonically the correct/best way to do this, but that's how I've handled development and (re)deployment in the past, across several versions of Java (6, 7, 8) and versions of Tomcat (the application that we use to host/run XTF). If you have any questions about the above, fire away -- it's a relatively easy process, and you can test/check things from your local machine with relative ease.
Hope that's helpful.