[Swordmaker]

Backups to iTunes from iOS 10 is not as secure as it was from iOS 9. Apple is promising a corrective update as soon as possible to the iTunes backup security. It seems that a programmer at Apple changed the hash algorithm in the iTunes security to an faster, simpler algorithm from the ones used in iOS 8 and iOS 9, which makes it easier and faster to calculate all the permutations of various possibilities of passkeys. . . but only on the PC or Mac on which iTunes backup exists. This does not effect the security of iOS on the device or on iCloud. It would, however allow someone to extract data from the iTunes backup by using a brute force attack if they had physical possession of the computer to attempt the attack. Apple is aware of the issue and will be pushing out the fix ASAP. — PING!

Apple iOS Security
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[Swordmaker]

If they have your computer, you have a lot more to worry about that them brute forcing their way into data on your phone. . . they already have your email and other data that's available on your computer.

You should have your entire computer FileVaulted with a strong password. . . and that would keep them out completely and ALSO out of iTunes and your iPhone and iPad backups, regardless of how weak the iOS hash might be. FileVault makes it all a moot point.