About

The SMS Backup & Restore app on Google Play (official name: com.riteshsahu.SMSBackupRestore) allows you to backup:

• your entire SMS history (including attachments)
• your whole or partial call history
• your Contacts ('Address book')

I wrote a Python script to extract data from those backups. Right now the script can:

1. extract the images out of your sent/received MMS messages
2. create a de-duplicated call log out of your entire call history
3. 🚧 (NEW) 🚧 extract any saved images, media, or keys from a user's contact files. ie. you chose a custom photo for someone in your contacts, made a backup, and now you want that photo back

Details

Messages/Backup format

The app saves backups of your SMS messages, images included, in an xml file that looks like sms-<timestamp>.xml. The images that were stored as MMS messages are then encoded as Base64.

This script searches for XML files for MMS messages, then decode the data from them to convert to regular images.

Calls are also saved in XML files, named calls-<timestamp>.xml. This script creates a CSV file out of all of your call backups, while accounting for duplicates.

V-Card/VCF parser

This app also lets you backup your contacts to one large VCF file. There are 3 different standards for V-Card files, but thankfully this parser supports all 3: version 2.1, version 3, and version 4.

Any of the following Vcard tags:

• PHOTO
• SOUND
• LOGO
• KEY

will be either downloaded (if they're stored) as a URL, or otherwise decoded (from Base64).

Usage

Prerequisites

• Python 3 (tested on Python 3.10.4)
• LXML

Steps

• Make sure the backups files start with either sms- or calls-, have the .xml extension, and are in their own directory.
• Make sure the contacts files all end in .vcf and are in their own directory

Usage

usage: backup_extractor.py [-h] [-i INPUT_DIR] [-t BACKUP_TYPE] [-o OUTPUT_DIR]

options:
  -h, --help            show this help message and exit
  -i INPUT_DIR, --input-dir INPUT_DIR
                        The directory where XML files (for calls or messages) are located
  -t BACKUP_TYPE, --backup-type BACKUP_TYPE
                        The type of extraction. Either 'sms' for message images or 'calls' to create a call log, or 'vcf' to extract media from a VCF/Vcard file
  -o OUTPUT_DIR, --output-dir OUTPUT_DIR
                        The directory where media files that are found, will be extracted to

Output info

• For extracting images from SMS backups only: if the metadata of the MMS message included a filename, then that will be used for the output, otherwise a random 10-letter filename will be created. At the end, duplicates will be removed.

• For creating call log, a file named call_log.csv will be created, that looks like:

Call Date (timestamp),Call date,Call type,Caller name,Caller #,Call duration (s),Call duration,Call Id #
1451965221740,"Jan 4, 2016 7:40:21 PM",Incoming,Dad,+18183457890,65,"1 minute, 5 seconds",0
1452020364934,"Jan 5, 2016 10:59:24 AM",Missed,(Unknown),+11234560987,N/A,N/A,1
1452107940226,"Jan 6, 2016 11:19:00 AM",Incoming,Michael Jordan,+11234567890,194,"3 minutes, 14 seconds",2

• For extracting images from VCard files only: the user's name will be stored in the filename. If no name is present then a random 10-letter filename will be used.

Limitations

• The image portions of the backup don't contain date information associated with them, so it's impossible to determine when an image was created

• EXIF data is lost when restoring images

The backups I had only contained image data, not audio or videos. I don't know if that's because there were no video sent, or because the app didn't backup messages with audio or videos in them

Future Roadmap

• Refactoring of the VCard/VCF parser
• Add the ability to convert export messages to a CSV file