Error 507 from iCloud essentially means you’ve got insufficient space in your account for more tasks. You may already have free space in iCloud, however this extra file-space is apparently not used for saving tasks in Reminders. The only way to solve this issue is to downsize your task list. If you’re attaching and syncing Photos with your tasks, you may consider unchecking that option in Sync Settings and deleting old, completed tasks from under the ’Done’ focus list.
Article ID: 595
Created On: Sat, Jan 12, 2013 at 11:44 AM
Last Updated On: Thu, Sep 18, 2014 at 9:17 AM
Online URL: https://www.2doapp.com/kb/article/i-get-error-507-when-syncing-with-icloud.html