Backup outlook even when it's running

Looking for a free backup program that can backup outlook even when it's running, and recommendation?

Window file backup will not backup when outlook is running.

Preferred but not a most
* should be able to deploy via group policy
*alert or not successful backup

I've seen http://www.safepstbackup.com who says thy do it, anyone experience with them?
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Abraham DeutschIT professionalAsked:
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Andrew LeniartFreelance JournalistCommented:
Acronis Backup will do this for you easily via its File Backup process.

Edit: Sorry, I missed the part about "Free" - Acronis Backup is not free.
Abraham DeutschIT professionalAuthor Commented:
I also came across https://sites.google.com/a/duplicati.com/duplicati/howtos/howto-backup-opened-files-e-g-outlook-pst it is open source and free, anyone experience with Duplicati?
Alba RichiCommented:
Thank you, I needed this information.
Abraham DeutschIT professionalAuthor Commented:
Let me know if it works for you
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