Time machine seems to not be backing up everything

Basically, after installing Yosemite I have this issue where most of the time I want to use Time Machine with my external HDD it says "Backing up... 1MB/6.35GB". It seems to be only backing up around about 6GB of my computer, where I know that there is definitely over 200GB of data that needs to be backed up. I have noticed that if I erase my backup HDD and then run a backup, it seems to work perfectly, however I do not want to erase my backup disk incase there happens to be a problem with the new backup which results with me not having a backup at all. Is this a bug or is it my hard disk drive? Is there a way I can fix this issue?
Thanks
I am running OS X Yosemite 10.10.1

If this isn't the initial backup, Time Machine just backs up what has changed, which is a much smaller amount than the total data size.

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