iCloud memory storage

I received a notice that my iCloud memory storage was almost at its max, close to 5 GB. I deleted the backup and did another backup and now the storage memory is only at 1.1 GB, more than 3.9 GB of free memory. This has happened to me at least 3 other times. Why does this happen and how can it be fixed other than deleting and backing up again?

Thanks

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