I first used LG Backup when I upgraded to Lollipop on my G3 to restore everything.
I'm pleased to report that it did a perfect job of migrating settings and apps from the G3 to G4! It was a concern - 32bit OS to 64bit in the G4, but no worries!
When you first power up the G4, ok to fill in your main Google user name and password and let it do it's thing.
1. The G3 - backup
There are two options:
Copy data to a new device
Backup & Restore [use this!]
- Select "Backup & Restore" - the second option.
- I skipped the data, and checked off everything else. The program doesn't like big 4Gb + files.
- It may take a few moments to make all options available. Check off all items.
- I then used a PC and USB cable to copy the backup directory from the G3 SD to the SD on the G4.
2. The G4 - restore
- Open LG backup.
- Again use "Backup and Restore"
- It will find your backup from the G3 on the SD card.
- Select all types. There's a warning about destroying data on the target. Go ahead. It will only write over some of the stuff that Google attempted to restore from your account,
- Let it rip!
The following will be restored:
- Call logs
- SMS and MMS messages (I use default sms app)
- Settings such as main screen and almost every app with data. For example, I use K9 email and it restored my various email accounts perfectly!
In summary, for LG users - LG backup does a great job. No need for other tools like Titanium backup, and the G4 isn't rooted yet so that's not a complete option anyway for now.
If you have anything to add, please do!