Replaced iMac Hard Drive, now having trouble getting TM back working

The drive on my iMac failed and was replaced. I used Migration Assistant to get data from my Time Machine backups (on 1TB Time Capsule) to the new drive--no problems! (Time Capsule is connected to my iMac by Ethernet as the wireless part of TC doesn't work anymore.) Now I'm trying to get Time Machine back working with this new drive and would like to continue from the backups I have. However, for several hours all it has done is cycle through Calculating Changes to Cleaning Up multiple times. When I look at the TM prefs, it knows the oldest backup was on Feb 28 before the drive starting failing, so I know it's seeing the backups on the TC. I believe I read that because of the new drive the first backup would be a full backup. However, for several hours all it has done is cycle through Calculating Changes to Cleaning Up multiple times.
I've been reading through some of the discussions and the tips at top of page, but am still not sure what to do. Is there something I can do to get this working from where I left off, or am I just going to have to reformat the TC and start over?
Thanks for any help/suggestions.

On a Time Capsule, deleting a lot of old backups is an excruciatingly slow process.
TM must delete the oldest backup, dismount the sparse bundle, compact the sparse bundle, then mount it again to see if it's made enough room. This can go on (as you see) for a very long time, even via Ethernet.
Since Time Machine will never delete the last remaining backup, it needs twice the space of the data it's backing-up, plus 20% temporarily for workspace. So if your TC isn't 220% the size of the data on your system, the backup will (eventually) fail, and you'll have no choice but to delete the sparse bundle.
On the other hand, if it's considerably larger than that, you can speed the process up a bit by manually deleting several old backups at a time, then compacting the sparse bundle yourself, per #12 in the Frequently Asked Questions *User Tip,* also at the top of this forum.
Click here to download the +Time Machine Buddy+ widget. It shows the messages from your logs for one TM backup run at a time, in a small window. That will show how much space it needs, and how much is currently available, so you can determine how to proceed.

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