The secret is running an Android Emulator.
1. Download and install the Andy for Android emulator http://www.andyroid.net/
2. From Andy, Install Fallout & Google Drive
3. Use Google Drive to backup and swap the save files from your phone to Andy & back
Have Fun 

Maybe when you play on PC with more RAM, it is better i don't know (My PC has only 4GB so BlueStacks uses 2GB...)