Copying Docker volumes to server

Question

I am still new to Docker but progressing through the Pluralsight learning path and lots of articles. I have learned to use volumes to persist data when containers stop and restart.

My question is how should I deploy volumes or is this bad design to have a volume dependency?

I do my local development and run things locally and all is great. I push to Docker Hub and pull down to my staging server. All working quite nicely EXCEPT emails.

The emails fail because the email templates are stored in a volume.

I am using Ubuntu with Solar-Putty so I can easily ftp the files into the proper volume location on the staging server.

or

I could ftp my entire volume to the Ubuntu staging server but in so doing do I corrupt some sort of Docker meta data unique id?

What is the best way to approach this dev ops process?