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Entire PC Backup

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When I back up the entire PC the first time it is 1.455 GB. When I back up the entire PC a second time it is 1/3 of that. Why?

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What is included in each backup is controlled by the settings inside the backup scheme. Simulate editng the task that created this backup and look at the scheme settings.

I suspect that you will find that you accepted the default settings for an incremental backup which is a full backup first followed by a series of incrementals.
If you want something different, you should create a new backup task with the correct settings.
The links below can help.

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Depending upon the type of backup scheme you wish to create, here is an example of each type. These can be set up for Disk image, or Partiton, or Files-folders backups. These example show how to set up automatic cleanup so the program will do the deletion after it reaches your set goal of how many chains to retain.

Editing an existing task is not recommended. Rarely does an edited task perform to user expectations. It is usually better to start with a new task using a new non-identical task name and point to a new storage sub-folder so each task has it own storage folder/sub-folder. Old task can be stopped or deleted from the task listings.

GH11. Create Custom Full Backup Scheme w/auto cleanup....Store/Keep 4 versions (chains). Use whatever number best fits the individual needs..

GH12. Create Custom Incremental Backup Scheme w/auto cleanup. ...Keep Full plus 6 Inc per chain. Store/Keep 4 chains. Use whatever number best fits your needs.

GH13. Create Custom Differential Backup Scheme w/auto cleanup. ...Keep Full plus 2 Diff per chain. Store/Keep 2 chains. Use whatever number best fits your needs.

GH25. Understanding differences between Inc and Dif for Safety

GH64. 71342: 2015 How to save a non-scheduled task.

GH63. 64640: Hints to help prevent issues with your TIB backup files creation.

GH63. 75086: A discussion on how to configure backup schemes.

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