Mavericks Clean Install now Time Machine won't work

Was having probs with Mavericks upgrade so decided to do clean install. Did TM backup and wiped main HD and check it then installed Maverics.
Performed migration to get Applications & Data back all seemed fine. TM showd all back up from before install.
TM reported fail on next day backup so I open TM to see what was there. I was shocked to discover all backups gone except one following migration and in progress backup that failed.  Never asked if old back ups to be deleted just disappeared.
As all apps & data on main HD I reformatted and Checked TM disk all fine. TM starts backup of HD around 750GB to TM 2TB disk. After many hours it reports an error occured, no details what so ever what error was. Have reformatted again and tried again same. Is this Apple saying my 4yo IMac needs replacing, do they need more money or am I missing something, have read TM support files that dont help.
Any advice would be great. Thank you.

What kind of external drive do you have and do you have software installed that came with it?
Pete

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