Time Machine-Using existing backupdb on Ext HD that was prev client's db

Hello,
I've recently setup Snow Leopard Server and want to use it to backup my iMac and MacBook. The iMac was previously backing up to an external hard drive via Time Machine and there is a full and up-to-date backup on that external drive. The drive is now plugged directly into the server computer. The iMac is setup to use this share as it's Time Machine backup source.
Now what I want is to reuse the the backup that is already there and not transfer 100+ GB over the network for the initial backup.
Is this possible?
Thanks for your help!

If you're just hanging the external drive off the server, and using that, then all you have to do is to change the iMac to point to the drive on the server instead of locally. Time Machine will figure out the rest.
If you're moving the backup onto a server volume. You can just copy it from the external drive on the server volume, and then point the iMac to the new location.

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