How can I create a state snapshot of my android device? I had restored my Android device (Samsung Note2) to the factory settings.

i have now added all my favorits apps and customized my settings.

How can i create a "memoey image"/"state snapshot" to restore from in the future.

I have used Kies, but it backups everything besides installed apps and device settings.

In generagl it's not creating a perfect snapshot.
You should be able to use adb backup which is takes a complete backup of the phone.

You'll need to install the Android SDK but this should allow you to backup the whole device

Backup

There are a number of parameters you can supply but the simplest way to do a full backup is to run: adb backup -all -f C:\backup.ab

More info can be found on this xda post which although it uses a Galaxy Nexus it should apply to any 4.0+ device

Restore

With your device connected open your command prompt again, and type:

adb restore C:\backup20111230.ab


replacing 'C:\backup20111230.ab' with the location of your backup file. 

You should see a screen like the one below:



Simply type in your current encryption password (if you've set one), and the password with which the backup was encrypted (if you chose to set a password), and the restore will begin. It again will take several minutes depending on the size of the backup and the options chosen.