Add help for file extraction to README

Improve backup list stability

Readme.md

@@ -96,6 +96,15 @@ the `-o <path>` (`--output <path>`option specifies a folder to export reports to
 # Export wifi, calls, voicemail as CSV files to disk in a folder named "exported/"
 ibackuptool -b $UDID --report system.wifi,phone.calls,phone.voicemail -f csv -o exported
 ```
+
+## Extracting files
+the `--extract <path>` parameter paired with the backup.files report will extract all files in a backup, with filenames matching an optional filter (specified by `--filter <filter>`).
+
+```bash
+# Export all photos onto "~/Desktop/Photos"
+ibackuptool -b $UDID -r backup.files --extract ~/Desktop/Photos --filter DCIM
+```
+
 ## Running Tests
 first, install [tap](https://www.npmjs.com/package/tap)
 

tools/reports/backups/list.js

@@ -31,9 +31,9 @@ module.exports = {
     udid: el => el.id,
     encrypted: el => el.manifest ? (!!el.manifest.IsEncrypted) : false,
     date: el => el.status ? new Date(el.status.date).toLocaleString() : '',
-    deviceName: el => el.manifest ? el.manifest.Lockdown.DeviceName : 'Unknown Device',
-    serialNumber: el => el.manifest.Lockdown.SerialNumber,
-    iOSVersion: el => el.manifest ? el.manifest.Lockdown.ProductVersion : '?',
+    deviceName: el => el.manifest && el.manifest.Lockdown ? el.manifest.Lockdown.DeviceName : 'Unknown Device',
+    serialNumber: el => el.manifest && el.manifest.Lockdown ? el.manifest.Lockdown.SerialNumber : 'Unknown Serial #',
+    iOSVersion: el => el.manifest && el.manifest.Lockdown ? el.manifest.Lockdown.ProductVersion : '?',
     backupVersion: el => el.status ? el.status.version : '?'
   }
 }