问题 Akeeba Backup 备份总是失败

INFO |160823 20:08:57|Proactive step break - file: <root>/media/zoo/images/614_9e03792ded2d8b6de673c8c7dd227b59.jpg - size: 11857 - req. time 0.00
DEBUG |160823 20:08:57|Kettenrad :: Domain object returned; propagating
DEBUG |160823 20:08:57|Kettenrad :: Break flag status: YES
DEBUG |160823 20:08:57|

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Finished operation 2

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DEBUG |160823 20:08:57|Successful Smart algorithm on Akeeba\Engine\Core\Domain\Pack
DEBUG |160823 20:08:57|====== Finished Step number 16 ======
DEBUG |160823 20:08:57|Kettenrad :: Setting the break flag between domains
DEBUG |160823 20:08:57|*** Engine steps batching: Break flag detected.
DEBUG |160823 20:08:57|*** Batching of engine steps finished. I will now return control to the caller.
DEBUG |160823 20:08:57|No need to sleep; execution time: 10500.79202652 msec; min. exec. time: 0 msec
DEBUG |160823 20:08:57|Saving Kettenrad instance backend
ERROR |160823 20:08:57|Cannot save factory state in db storage, storage key backend.id52
--- END OF RAW LOG ---

Backup Halted and Will Resume Automatically

The backup operation has been halted because an error was detected. However, Akeeba Backup will attempt to resume the backup. If you do not want to resume the backup please click the Cancel button below.

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For your information, the last error message was:

Cannot save factory state in db storage, storage key backend.id53