A couple of weeks ago I was using my MBP Retina 13" which I use quite rarely. I 
have an external drive attached (it contains my Photos and iTunes Libraries as 
well as quite a bit of other data) which is included in the backup.

At the time I wasn't doing anything much, just reviewing emails I think. I 
think I had used it the previous day after unmounting the external drive for 
some lap work. I reattached the external drive and it mounted typically without 
event.

Shortly after it set about a routing back up. After a long "Preparing your 
backup" it said, the backup is too large for your backup drive. 

The backup file currently is around 650GB made up of ~550GB on the external 
drive and ~100GB on the MBP. My backup drive is 1TB and has ~300GB+ of free 
space.

I suspect TM has had a fit and thinks it has to do a large backup of something, 
but hardly anything has changed. Just the emails I viewed and some browsing.

Do I blow away the sparesebundle (again) and reset the backup or is there 
another fix for this on going habit of TM?


Regards


Pete
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