Dear Pondini
Thanks for your prompt and informative reply.
It's a new, different drive, even if it has the same name, so Time Machine will do a full backup of it.
(Every drive has a UUID -- Universally Unique IDentifier, that's only changed when you format or erase it. That's what OSX uses to identify a drive, not the name. That's how you can change the name of a drive, or have two with the same name, without causing havoc.)
This makes sense although I didnt know this!
If you'd done a full system restore with Time Machine, instead of the clone, that should have left a "trail" so the next backup would have known what happened, and automatically "associated" the new drive with the old drive's backups.
I did spend a lot of time on the forums researching the best methods for doing a drive replacement and there seemed to be a consensus that the clone was more accurate than the system restore with TM, so for better or worse this I what I did.😟
You've posted in the Snow Leopard forum, so I'll assume that's what you're running -- if so, there's nothing you can do now.
If you've upgraded to Lion, however, you may be able to manually do the "association," per #B6 in Time Machine - Troubleshooting.
Yes, I'm running 10.6.8, is there really know way the surviving back ups are useful in snow leopard now? I didn't have plans to upgrade just yet.
I hope you've not been deleting things from your internal HD to save space, counting on Time Machine to keep the backups indefinitely. If so, that's very dangerous -- see Time Machine - Frequently Asked Question#20 for an explanation.
No I would never do this, everything on the Macbook Pro is kept and daily backups kept so I have everything pics, music etc all on the newly installed HD plus the back up. I am overdue on this having not backed up since the new drive was installed two weeks ago.
Your only other option is to get a new backup drive and let Time Machine start fresh on it. You can always see and restore from the old ones, via the Browse... option, per FAQ #17.
Is this my best option, to start a new back up and if so could this be done on my current back up drive? Its capacity is 500GB and I have 250GB of data.
Is one back up sufficient if all your data is also on your computer?
Many thanks once again for your help.
regards
Andy