Hard drive replaced, backup successful, now can't sync to time machine

Hi Guys
I had a failing hard drive (S.M.A.R.T. status) so I got the hard drive replaced on my apple care plan.  I had been able to successfully back-up the entire system using a WD My passport for Mac (1TB).  The tech uploaded the new Lion operating system and then plugged in my WD to reinstate the computer.  All went well.  However, now my computer won't continue the Time Machine backups from where it left off, rather wants to reback-up the whole system again, which it can't as there is insufficient room on the drive.  Do I have to delete everything on the external drive and start again?

There's no way to avoid the need to back up all your files, as Time Machine has no way of knowing they're the same as they were on the old drive. The best solution is to start a new backup on another external drive. You need more than one backup anyway, to be safe. When you're sure you'll no longer need the data on the backup drive you have now, erase it and start over.

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