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Outlook files not backing up

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I did a full backup of a windows 10 PC, and when I look in the backed up folders where .PST and .OST files are stored (such as Users/me/documents/OUTLOOK FILES) the backup shows the folder is empty but it is NOT empty on the original drive.

Other folders that are storing older .PST files look fine, and explorer is set to display hidden files, so that's not it.

Any idea what's going on?  Thanks, Steve

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Steve, welcome to these public User Forums.

See KB 48032: Acronis software: *.OST-file is not backed up - for an explanation of this Microsoft restriction.