This is seriously URGENT! Apple has just sent an email to its developers regarding the CloudKit data wipe scheduled on July 7. So, if you have uploaded any sort of data on CloudKit, it’s time to save it somewhere else.
This also indicates that the date wipeout will possibly follow the release of iOS 8 beta 3 and third update to OS X Yosemite. Have a look on the copy of the mail sent by Apple,
Dear Developer,
We will be performing a server-side data wipe on all CloudKit public and private databases for iOS 8 beta and OS X Yosemite Developer Preview users on July 7, 2014. The following iCloud features will be affected: iCloud Drive, iCloud Photo Library, and Mail Drop.
Photos and videos stored in iCloud Photo Library will remain on their original iOS 8 devices and will upload to iCloud Photo Library again automatically. iCloud Drive can be re-enabled from Set up Assistant after upgrade. If you choose to store your documents in iCloud Drive, your Documents & Data will automatically be copied to iCloud Drive. iCloud Drive will not update across earlier seeds or operating systems. Attachments sent through Mail Drop will expire and need to be resent after you upgrade.
If you have any questions, visit the Apple Developer Forums.
Best regards,
Apple Developer Technical Support
As clear, you will need to manually transfer the files stored in iCloud Drive and Mail Drop to CloudKit while that of iCloud Photo Library will shift automatically. This may not be the last time we are facing server-side wipe outs as few may come before next beta updates.
Have not backup the CloudKit data yet? Do the task now!