1. Config files should be copied. The backup folder is located at C:\Users\YourUser\AppData\Local\RepetierHost.
2. Export Printer Settings: Select Printer Settings > Export in RepetierHost.
3. Paste the backed-up files into the new installation directory in order to restore Settings.
4. Check EEPROM Settings: Verify EEPROM values if you are using Repetier-Firmware.
5. Reinstall Drivers: Verify that the serial and USB drivers correspond to your printer.
6. Check G-code Scripts: In Printer Settings, look for start/end G-code.
7. Sync Slicer Profiles: If necessary, make a copy of the slicer configuration files.