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Failed to create volume snapshot

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Hi everyone,
i seem to have a problem with my acronis software.
I am currently using Acronis backup and recovery latest version.
I have been noticing that when i set my backup up, it works no problem on the fist night. But on the second onwards it keeps failing. can anyone please help me resolve this.
here is the error message.

1 Information 9/01/2011 9:01:06 PM Priority changed to Low.
2 Information 9/01/2011 9:01:06 PM Analyzing partition '0-0'...
3 Information 9/01/2011 9:01:06 PM Analyzing partition 'C:'...
4 Information 9/01/2011 9:01:06 PM Analyzing partition '0-0'...
5 Information 9/01/2011 9:01:07 PM Analyzing partition 'E:'...
6 Information 9/01/2011 9:01:07 PM Analyzing partition 'C:'...
7 Information 9/01/2011 9:01:08 PM Analyzing partition 'E:'...
8 Information 9/01/2011 9:15:41 PM Create Incremental Backup
From: Disk '1', Disk '2'
To file: "file://backupnas\backups\ARES\ARES_2010_10_30_21_00_59_781D.TIB"
Compression: Normal
Exclude: Files matching mask
Match criterion: C:\ProgramData\Acronis\BackupAndRecovery\MMS\Temp\acr446D.tmp,

9 Information 9/01/2011 9:15:44 PM Pending operation 147 started: 'Creating partition image'.
10 Information 9/01/2011 9:15:58 PM Locking partition 0-0...
11 Error 9/01/2011 9:27:25 PM Operation with partition '0-0' was terminated.
Details:
Failed to create volume snapshot.

Error code: 0x70021
Tag: 0xDF81DA2C74EC5083
Failed to set snapshot bitmap.

Error code: 0x10C44E
blocks = 35,152,220 (0x218615C)
Tag: 0x14181C22EF45ADB7
Not locked.

Error code: 0x9
code = 3,758,096,392 (0xE0000008)
Tag: 0xABF5B651C7D88E41
Additional info:
--------------------
Error code: 502
Module: 1
LineInfo: a164035b3ff39281
Fields:
Message: Operation with partition '0-0' was terminated.
Details:
Failed to create volume snapshot.

Error code: 0x70021
Tag: 0xDF81DA2C74EC5083
Failed to set snapshot bitmap.

Error code: 0x10C44E
blocks = 35,152,220 (0x218615C)
Tag: 0x14181C22EF45ADB7
Not locked.

Error code: 0x9
code = 3,758,096,392 (0xE0000008)
Tag: 0xABF5B651C7D88E41
--------------------
Error code: 33
Module: 7
LineInfo: df81da2c74ec5083
Fields:
Message: Unable to create volume snapshot
--------------------
Error code: 50254
Module: 16
LineInfo: 14181c22ef45adb7
Fields: blocks : 35152220
Message: Failed to set snapshot bitmap.
--------------------
Error code: 9
Module: 0
LineInfo: abf5b651c7d88e41
Fields: code : 3758096392
Message: Not locked.
--------------------
Task 'Incremental backup' has failed on machine 'ARES.scorptec.com.au'.

thank you for all your help

0 Users found this helpful

If you manually try to run the failed task, does it run or fail?

Is the NAS available at all times?

Is the path to the NAS as a mapped drive, UNC or IP?

I just tried to start the backup manually and it started no problem, will let you know if it finishes fine,
we connect to the nas through UNC address and it is never off.