PRoblems with Time Machine

Lately when I tried to do a manual backup with Time Machine I would get an error.  I can't remember exactly what the error was.  All I remember is that it said it could not backup.  Finally had time to spend to try and figure this out.  I unplugged it from the back of my computer and plugged it into the front of my machine.  That helped, for a couple hours.  It backed up on the hour as is the norm and would back up when I did a manual backup but now it is not backing up on the hour anymore.  By selecting a manual backup did that  stop the automatic backup?  I checked my setting and it is still turned on.
nsitedesignsAsked:
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Eoin OSullivanConsultantCommented:
A few questions?
1. How big is the HD on the Mac and how many Gb are used
2. How big is the external HD and again how much space is used
3. Can you confirm the version of OSX you're using

If there's plenty if space on the external HD the first thing I'd usually do is quit all applications, run Disk Utility and repair permissions on the mac HD (not the external HD) and then restart.
After restart TimeMachine should run an hourly backup as normal. You can usually see if TimeMachine is running by enabling the menubar icon in TimeMachine System Preferences.
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