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Outlook backup: Failed to open data stream

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My email backup, scheduled daily, has failed every day for a week now.
Eventcode: 0x0064008A+0x000B03E9+0x00040011+0x0000FFF0+0x80070002, unknown to http://kb.acronis.com/errorcode/.
Same problem for my system / file backup, scheduled daily, eventcode identical.

Does anyone know what to do?

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