I use Google Voice. It's not really an SMS backup app but messages are stored in the GV account. The messages on the device are just synced with the GV account so if anything happens to the device (lost, stolen, broken, new device,switching to an entirely different OS, etc) I can just load the GV app again sync. However, if messages are deleted from the GV account and purged from trash that's it.
With GV, messages are accessible and can be sent/received via the GV site.
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