Found the following in your logs.
Code:
[ImageManager] Stage1: Creating tmp folders. /media/hdd/imagebackups/
[ImageManager] Stage1: Creating backup Folders.
[ImageManager] Stage1: Making Root Image.
[ImageManager] Stage1: UBIFS Detected.
>>> Error: [<Components.Task.FailedPostcondition instance at 0x30601e8>]
job Components.Task.Job name=Image Manager #tasks=14 completed with [<Components.Task.FailedPostcondition instance at 0x30601e8>]
 in Components.Task.Task name=Backing up Root file system...
Can you telnet the following comamnd and post back results please. (Link in signature may be helpful)

cat /proc/mtd

Will get advice from Andy on what to do next.