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How does the backup work?

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If I delete files on the hard drive and then do an incremental backup, does Acronis delete the files on the original backup or make note of the deletion in the incremental backup?

Thanks

 

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Barton, welcome to these User Forums.

Any files that you delete after making a backup image would only be missing from the next backup image you create - no deletions are done for any content in an existing backup image file. 

Each backup image captures a snapshot of your system as it is at that point in time, where an incremental backup captures only the changes made since the initial Full backup in the first incremental file, and then only the changes made since the last incremental file for all subsequent backups. 

A corollary to what Steve said (and a life saver for me a couple times) is that you can recover a deleted file from old backups even if you have taken recent backups since the deletion.