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I've tried to do a full backup of all my apps today, and two of them have a question mark (?) on their name and the Save and restore app crash when trying to save them.
Example of an app with a ? on its name: https://play.google.com/store/apps/details?id=com.ezeeworld.qelmc&feature=nav_result#?t=W251bGwsMSwx.....
This bug may also occurs with other special chars (probably other punctuation marks (like !) and maybe special international characters (like ç or ù).
I hope you can fix this bug on this app soon 
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