Is there a good way to verify an iPhone backup?

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This discussion thread was locked by steve2470 (a host of the Computer Help and Support group).

I'm pretty current (perhaps a version point or two behind), but more than once I've done a backup, only to then later do a restore or update and being told the backup failed. Even if I tried to restore immediately after, as a test, I might be told it failed. Not why, just that it didn't. If I do it simultaneously with an upgrade, I risk basically wiping everything, as I recently did when moving to 9.x. I had to then buy a program that can fish through the backup info on my computer, and it recovered a lot, but it's a huge PITA and, as a consumer software developer for a long time, I can say it's unacceptable. Why can't they have a "backup analysis" that we can run that shows it actually succeeded, instead of waiting for a critical time only to find out it didn't work?

On edit, I just backed it up before moving to 9.2, and got this error:



So can I not move to 9.2? How the hell do I fix this?

It's a iPhone 5, but there's no reason the backup should fail, especially if it says it succeeded in iTunes. Is there a log file somewhere?