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Not backing up Outlook .ost files

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I have recently upgraded to Ver 15, and, among other areas, am asking it to back up my Outlook files. It backs up the .pst files but not the .ost files.

I cannot see any exclusion for these files - can anyone shed any light on why not? Is it because the file should be a direct copy of the mailbox on the web and Acronis have therefore decided that it does not need to be backed up and hardcoded the exclusion somewhere?

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Have a look at thread link below. Mark Wharton does a superb job of explaining the situation of Outlook file backup. The real culprit in this is Microsoft.

https://forum.acronis.com/forum/88437