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backing up 200GB of 3.97 TB (drive is only 500GB)

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So Acronis cloud (1TB) keeps running out of space backing up a 500GB drive on my macbook pro.  The reason why, is it thinks there are 4TB of data to back up.  Dropbox (3TB cloud storage) is excluded.  

 

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Paul, welcome to these public User Forums.

Caveat: I am a Windows user with no direct Mac experience.

What type of backup are you creating here? 
Is it a Disks backup of the drive or a Files and Folders backup?

Have you followed the advice in the ATI 2018 for Mac User Guide:  Excluding items from backups?

To exclude items from an online backup:

  1. Before you start the backup process, click Optimize backup below the backup source icon.

    exclusions smart

  2. Clear the check boxes next to the items that you want to exclude, and then click Done.