Back up not working

and i get this error when ever i try to back it up on the local box its self

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Log Entry Details
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Type: Error
Date and time: 9/05/2012 3:32:01 PM
Backup plan: Backup 9/05/2012 3:30:18 PM
Task: Simple backup
Code: 66,038(0x101F6)
Module: 1
Owner: SHayes@FACTOR
Message:
Operation with partition 'C:' was terminated.
Details:
Failed to create volume snapshot.

Error code: 0x70021
$module = "disk_bundle_vs"
Tag: 0xA5695862AAF8E67C
Failed to start creating the volume snapshot.

Error code: 0x10C442
$module = "disk_bundle_vs"
Tag: 0x14181C22EF45B0C2
Unknown status.

Error code: 0x9
code = 2,147,942,421 (0x80070015),
$module = "disk_bundle_vs"
Tag: 0x2AACB7B2AB852AC
The device is not ready

Error code: 0xFFF0
code = 2,147,942,421 (0x80070015),
$module = "disk_bundle_vs"
Tag: 0xBD28FDBD64EDB8E0
Additional info:
--------------------
Error code: 502
Module: 1
LineInfo: a164035b3ff39287
Fields: $module : disk_bundle_vs
Message: Operation with partition 'C:' was terminated.
Details:
Failed to create volume snapshot.

Error code: 0x70021
$module = "disk_bundle_vs"
Tag: 0xA5695862AAF8E67C
Failed to start creating the volume snapshot.

Error code: 0x10C442
$module = "disk_bundle_vs"
Tag: 0x14181C22EF45B0C2
Unknown status.

Error code: 0x9
code = 2,147,942,421 (0x80070015),
$module = "disk_bundle_vs"
Tag: 0x2AACB7B2AB852AC
The device is not ready

Error code: 0xFFF0
code = 2,147,942,421 (0x80070015),
$module = "disk_bundle_vs"
Tag: 0xBD28FDBD64EDB8E0
--------------------
Error code: 33
Module: 7
LineInfo: a5695862aaf8e67c
Fields: $module : disk_bundle_vs
Message: Failed to create volume snapshot.
--------------------
Error code: 50242
Module: 16
LineInfo: 14181c22ef45b0c2
Fields: $module : disk_bundle_vs
Message: Failed to start creating the volume snapshot.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 2147942421, $module : disk_bundle_vs
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8e0
Fields: code : 2147942421, $module : disk_bundle_vs
Message: The device is not ready
--------------------
Acronis Knowledge Base: http://kb.acronis.com/errorcode/

Event code: 0x000101F6+0x00070021+0x0010C442+0x00000009+0x80070015+0x0000FFF0+0x80070015

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Has anyone come across these errors?

The top google result for 'snapshot 0x80070015' (from the innermost error) is http://social.technet.microsoft.com/Forums/en-US/smallbusinessserver/th… Maybe one of vss writers is in failed state.