Time Machine Error - Time Capsule not big enough?

I have a 500GB Time Capsule which I use solely to back up my Macbook. Time Machine is giving me an error message as below:
This backup is too large for the backup disk. The backup requires 176.38 GB but only 121.14 GB are available.
Looking on the Time Capsule, the current Sparsebundle is about 376GB - so I'm not sure why Time Machine is suddenly failing to just increment onto that?
Am I missing something?

pompeygreg wrote:
I have a 500GB Time Capsule which I use solely to back up my Macbook. Time Machine is giving me an error message as below:
This backup is too large for the backup disk. The backup requires 176.38 GB but only 121.14 GB are available.
Looking on the Time Capsule, the current Sparsebundle is about 376GB - so I'm not sure why Time Machine is suddenly failing to just increment onto that?
Do the math: 500 GB less 376 GB gives 124 GB, around the size that Time Machine says is available. It seems that Time Machine is trying to create an entirely new, complete backup of your computer. Did anything change with your computer recently, such as the disk drive or main logic board? Either of these can make Time Machine want to start over.

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