In April, Microsoft released a new Windows Phone app called Contacts+Message backup, which was designed to back up all of a phone user's contacts (in VCF format) and messages (SMS and MMS including attachments). However, the app required that a SD card be installed on the device in order to back up that content. Thanks to the most recent update, the app no longer has that requirement.
Notifying: Displays apps that are sending the most notifications. 
While there are only a few Windows Phone devices that lack a SD card slot, this update should allow those phones that don't have such a feature to back up their contact and message content and restore them later if need be. The change notes for the update do mention a known issue with the app:

Contacts + Message Backup app is a Settings app that enables you to make backup of all your contacts (in VCF format) and messages (SMS & MMS including attachments) to SD card (in XML format) for later restore to same or another Windows Phone. Backup is stored in 'backup+restore' folder on the SD card. Contacts + Message Backup app is a Settings app that enables you to make backup of all your contacts (in VCF format) and messages (SMS & MMS.
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'Restoring a backup of messages from a dual SIM Windows Phone restores all messages to message store for the first SIM/slot.'
Thanks to everyone for the tips!
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