Workaround for Windows Phone 8.1 Update Preview Backup failed

Currently using the developer Preview (8.10.14219.341), has not recently been able to back up text + apps + settings, the progress bar reached 97% or 99% after the prompt:

There is a problem backing up your settings. Try again later.

MSDN has a number of solutions that don't solve my problem, such as: Do not use Tera lockscreen, remove calendar tiles, turn off synchronization of text messages, etc.

I looked at the size of the backup file stored in OneDrive for more than 300 MB. If you take a full sync, it's obvious that with OneDrive, the urine in Chinese networks can't be that fast. Since it is an incremental backup, is it because the previous version of the backup file and the current version is incompatible? In short, the previous backup file to try, again synchronization, problem solving

Workaround for Windows Phone 8.1 Update Preview Backup failed