Ettore Dreucci

Quick and dirty:

• Connect your device to the PC via USB
• Enable debugging mode
• From the terminal:

adb root
adb pull /data/data/com.google.android.apps.authenticator2/databases/databases
sqlite3 ./databases "select * from accounts" > ./gauth_backup.txt

If you want to generate an auth code from a TOTP secret you can use oathtool:

oathtool --base32 --totp "<secret>"

Enjoy!

Pro tip: to generate all the QR codes from the sqlite database you could use this python script (which requires the qrcode module):

import qrcode
import sqlite3
conn = sqlite3.connect('databases')
c = conn.cursor()

for idx, (email, secret, issuer) in enumerate(c.execute("SELECT email,secret,issuer FROM accounts").fetchall()):
    url = 'otpauth://totp/{}?secret={}&issuer={}'.format(email, secret, issuer)
    print url
    im = qrcode.make(url)
    im.save('{}.png'.format(idx))

(source: thouis)