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I don't know of any bugs in the Maps app. The geobase the Maps app uses is, admittetly,not as mature as Google's. However, you can still use the Google Maps app or any of the many other mapping apps available in the App Store if you don't like Apple's.

This may be caused by a corrupt existing backup that needs to be deleted, or by data on your phone that is preventing the backup from succeeding.  To troubleshoot these, try deleting your last iCloud backup (if you have one) by turning off iCloud Backup in Settings>iCloud>Storage & Backup, then tap Manage Storage, swipe across your backup and tap Delete, then go back and turn iCloud Backup back on and try backing up again.

If it still won't back up, you may have an app that is preventing the backup from succeeding.  To locate which one, go to Settings>iCloud>Storage & Backup>Manage Storage, tap the name of your device under Backups, under Backup Options tap Show All Apps, then turn them all to Off (including camera roll) and try backing up again.  If it succeeds, then the camera roll and/or one of your apps is preventing the backup and you'll have to located by process of elimination. Turn the camera roll On and try backing up again.  If it succeeds, turn some of your apps to On and try backing up again.  If it succeeds again, turn some more apps to On then try again; repeat this process until it fails.  Eventually you'll be able to locate the problem app and exclude it from your backup.

What is your technical support question?