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TI fails - unable to create volume snapshot 0x70021

Thread needs solution

I'm attempting to BU a hd in a HP-DV6-6110US and it keeps failing. I'm attempting to BU all partitions including the hidden partitions before replacing the Win7 x64 build with a Win8 x64 build. The current build is super sick (e.g. VERY slow) and a total new OS image must be put on the HD. I prefer to install Win8 but just incase I run into other issues I want to keep the original recovery partition. Currently I have only one laptop HD and a few external HD where I plan to store the TI image.

Event Details
Operation with partition '3-0' was terminated.
Details:
Unable to create volume snapshot (0x70021)
Tag = 0xA5695862AAF8E6A0
Failed to obtain the snapshot state. (0x10C44A)
Tag = 0x14181C22EF45B09F
Already stopped. (0x9)
code = E0000004)
Tag = 0x2AACB7B2AB852AC

I've attempted to find more information in the Acronis Knowledge Base for Event code: 0x000101F6+0x00070021+0x0010C44A+0x00000009+0xE0000004
But no information is available for this event code.

0 Users found this helpful

Run chkdsk /r on that drive.
Also run a drive checking utility from the drive manufacturer, as those sometimes catch errors missed by chkdsk.

One of the partitions was a FAT 32 and contained HP tools. I deleted this partition from the backup and TI then ran without issue. I was running the BU remotely via TeamViewer on my brother's system. We're now ready to install Win8 as a fresh install.
Thanks for your suggestions.

I frequently get the same error, but all diagnostics show no problem with either drive.... just this morning:
Operation with partition '5-0' was terminated.
Details:
Unable to create volume snapshot (0x70021)
Tag = 0xA5695862AAF8E6A0
Failed to obtain the snapshot state. (0x10C44A)
Tag = 0x14181C22EF45B09F
Already stopped. (0x9)
code = E0000004)
Tag = 0x2AACB7B2AB852AC

I always am confused by the message as to which drive is the problem. Is it the source or destination? "partition 5-0" is not descriptive enough for me.