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Unable to perform backup: "Unable to create volume snapshot (0x70021)"

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I have installed an new PC with Win 8.1 Pro with all latest updates. The first two backups that I performed with Acronis were successful but the latest one failed with the following message:

Operation with partition '3-0' was terminated.
Details:
Unable to create volume snapshot (0x70021)
Tag = 0xDF81DA2C74EC50D4
Failed to set snapshot bitmap. (0x10C44E)
blocks = 1869FFF)
Tag = 0x14181C22EF45AE34
The operating system might be overloaded. We recommend that you perform the operation later. (0x9)
code = E0000008)
Tag = 0x2AACB7B2AB852AC
More information about this error and solutions may be available online in the Acronis Knowledge Base.
To access the online resource manually, enter the event code at: http://kb.acronis.com/errorcode/
Event code: 0x000101F6+0x00070021+0x0010C44E+0x00000009+0xE0000008

I have attached the full error log.

Can somebody help please.

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acronis_backup_error.zip 2.63 KB
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