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Failed to create volume snapshot

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Always stalls at 20% for about 15-23mins. temp file gets created at 2GB but the XML stays 2MB. It was able to run it once after doing chkdsk but now it's giving errors again. I cant afford to lose so much downtime on chkdsking every week to run the job.

-tried re-creating the backup
-deleting the lck files on fileserver
-deleting the old xml
-kill acronis processes and mms.exe
-checked vssadmin list writers. all stable
-tried changing the back up use system VSS
-tried enabling shadow copy on C:\
-tried backing up locally to D:\ instead of fileserver
-it has enough space to create a temp write file

Any help is appreciated. Nothing helpful in the event log

Windows server 2008 R2/64bit/SP1

=======log begin======

Operation with partition 'C:' was terminated.
Details:
Failed to create volume snapshot.

    Error code: 0x70021
    $module = "disk_bundle_vs"
    Tag: 0xA5695862AAF8E6DD
Failed to obtain the snapshot state.

    Error code: 0x10C44A
    $module = "disk_bundle_vs"
    Tag: 0x14181C22EF45B0DD
Already stopped.

    Error code: 0x9
    code = 3,758,096,388 (0xE0000004),
    $module = "disk_bundle_vs"
    Tag: 0x2AACB7B2AB852AC
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: 0xA5695862AAF8E6DD
Failed to obtain the snapshot state.

    Error code: 0x10C44A
    $module = "disk_bundle_vs"
    Tag: 0x14181C22EF45B0DD
Already stopped.

    Error code: 0x9
    code = 3,758,096,388 (0xE0000004),
    $module = "disk_bundle_vs"
    Tag: 0x2AACB7B2AB852AC
--------------------
Error code: 33
Module: 7
LineInfo: a5695862aaf8e6dd
Fields:  $module : disk_bundle_vs
Message: Failed to create volume snapshot.
--------------------
Error code: 50250
Module: 16
LineInfo: 14181c22ef45b0dd
Fields:  $module : disk_bundle_vs
Message: Failed to obtain the snapshot state.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields:  code : 3758096388, $module : disk_bundle_vs
Message: Already stopped.
--------------------

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Comments: 7092

Hello Tommy,

Please follow the troubleshooting steps from this article and first of all update to the latest build version, as it contains the latest SnapAPI version, which is in charge of all Acronis software I/O operations on the hard disk. If the issue persists please create a support ticket for deeper investigation.

Thank you,