HT201250 How do you let time machine know that a restored drive does not need a brand new backup set and just append to the old one?

I had an external drive failure and had to buy a brand new drive. I was able to restore my info onto a new drive, about 1.5 TB of data. When I go to launch time machine now with the new drive connected and my backup connected, it treats the new drive as if it had different data and wants to create a whole new backup set when it should just append. How do I get around this?
I could just reformat the backup drive and start fresh again but would rather not do that if I can avoid it, just in case there were errors in copying etc.

Hi
I should have been more clear, sorry. I work from a laptop. I have 2 external drives - one for my projects which failed but has since been replaced and restored from a backup. My 2nd external drive is the time machine backup drive.
When my project drive crashed, I bought a brand new drive and restored it using my time machine backup drive.
Now the data exists on 2 drives - the time machine backup drive, and the new drive. When I connect the backup drive now, it thinks my new drive has new data, probably since it is a new device/drive, and wants to do a brand new backup, when in fact the data already exists on that very drive. It shouldn't have to back up all 1.5 TB when nothing has changed!
Unless there is a way to tell time machine to simply append to the old backup, I think it will try and do a new backup (1.5 TB). I'm thinking maybe I should just initialize my time machine backup drive now and start over so it is only one backup set of 1.5 TB instead of (2) sets of 1.5 TB!

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Walter Goodman wrote:
Time Machine says my external hard drive does not have enough space for the current backup. It needs 34 G out of a 250G hard drive. All that is on the drive is earlier backups.
See #C4 in Time Machine - Troubleshooting.
If that doesn't clear it up, how much data is on your Mac? If TM is only trying to back-up 34 GB, it should be able to delete old backups to do that (assuming you're running Lion).
It sounds like your backups may be corrupted. Try to repair them, per #A5 in Time Machine - Troubleshooting.
I recently added memory, which may confuse Time Machine into thinking it is a new computer.
If that's all you did, no.
How can I erase old backups and complete this one?
Just erase the drive per #1 or #2 of Using Disk Utility.

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Thanks for using Apple Support Communities.
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HT201250 How do you let time machine know that a restored drive does not need a brand new backup set and just append to the old one?

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