Hello Charles and welcome to the forum 🙂
It depends on the deployment model, but in general you need to do 2 things:
- Restore all files to the correct paths.
- Restore the DB.
Which paths are relevant and how the DB can be restored, is explained here.
If you are running the standalone version (eg. no separate DB system), you can reinstall and then copy+paste the REI3 data folder (chosen during installation, default is: c:\REI3) and the configuration file from the REI3 application directory (default: C:\Program Files\REI3).
