Recreating the User Profile Service application using the old databases

Hello! 

Recently I have been doing some testing about the User Profile service application, and I had some issues with this picky service. I tried to fix it, but the only way to solve this is deleting the current UPA and creating one from scratch.

Guess what!!... Some users have information at MySite.. So I can't delete the content databases..

So based on this, and avoiding bunch of emails from the business asking for their information, let's recreate the UPA using current databases.

1. Via Central Administration, STOP the User Profile Application service on all servers in the farm.
2. Delete the User Profile Service Application, but DO NOT CHECK the option "Delete data associated with the Service Application"
3. Identify the names of the User Profile (Social, Sync, Profile) databases.
4. Open the SharePoint 2013 Management Shell
5. Run the New-SPProfileServiceApplication command passing in parameters for: ApplicationPool, Name, MySiteHostLocation, ProfileDBName, ProfileSyncDBName, SocialDBName. This will create a new Profile service app using our restored profile databases. 
6. Run the New-SPProfileServiceApplicationProxy command passing in parameters for: ServiceApplication, Name and also include the DefaultProxyGroup.
7. Start the UPA Service on all servers in farm (all servers required)
8. Run an IISReset on each servers
9. Start the User Profile Synchronization Service on the application server (server that will host this service) 
10. Wait... 
11. Wait...... 
12. Ensure that it is started before proceeding..!
13. Ensure that the User Profile Sync timer job is enabled and set properly and then start a full import.. 

 Remember to test this at lower environments BEFORE doing this at PROD

Cheers!