Convert TimeCapsule Backup From one Computer to Another

I used migration assistant with my old Macbook in target disk mode to transfer everything over. The first time TM ran, it asked me if I wanted to "adopt" the existing backup. It warned me I couldn't go back and use it from the old machine. I said yes. I thought everything was fine until a few weeks later it said the backup was corrupted and it needed to "start over". I said yes. I thought everything was fine until I came back the next morning to find a login prompt. My MBP had rebooted overnight, probably about the time the backup would have finished. I decided to take matters into my own hands and I went over and renamed the old sparsebundle to sparsebundle.NOT. The next backup went flawlessly and completed in about 1/4 the time. When I get around to it, I'll go in and delete the old sparsebundle. I don't need versions of files going back 2 years (the last time I reset a TM backup and started over).

I suggest you CAREFULLY delete the sparsebundle completely and start over rather than "adopt" it which might set you up for a ticking time bomb leading to corruption at a time when you least expect it.