Can I backup my APN settings? Where are my Access Point Names stored in the file system? Can I back them up via adb shell?

My phone is unlocked (AT&amp;T Contract. Le sigh.) and I'm inching towards modding it but I want to be sure I've got my APN settings.
Yes, just copy the /system/etc/apns-conf.xml file.

You can also use an app like APN Backup &amp; Restore: https://market.android.com/details?id=com.riteshsahu.APNBackupRestore

Edit: To backup manually-entered APNs (or ones otherwise not part of your ROM, such as ones "imported" when you insert a new SIM card) you also need to back up

/data/data/com.android.settings/shared_prefs/com.android.settings_preferences.x­ml


APN Backup &amp; Restore does not do this.