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Backup handing on .ost file


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I just got a DS216+ii and having been running cloud station backup and it appears to the hanging on backing up my outlook .ost file (around 4 GB in size).  It's been multiple hours and the status has been on preparing the entire time.  Is this just because the file is big or is there some issue with large file sizes?


I am not running outlook, so the file isn't locked (I have seen the locked status before and restarted my machine and haven't opened up Outlook).


Any help would be appreciated.




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Can you set it to exclude the OST file as it is not needed,  that is your offline storage file copy of what is on the server and can be rebuilt automatically when it redownloads email from server if you have to rebuild.

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