Backup Error

The backup was working fine prior to this.
Not sure if it has anything to do with acronis trying to do a differential backup right after a full back (which I've reconfigured that). Hope it is not a big concern.

1 Information 5/3/2013 12:30:38 AM Command 'Running backup plan 'Backup1'' is running.
2 Information 5/3/2013 6:18:02 AM Command 'Backing up' is running.
3 Information 5/3/2013 6:18:17 AM Analyzing partition '1-0'...
4 Information 5/3/2013 6:18:18 AM Create Differential Backup
From: Disk '1'
To file: "file://backupserver\ServersBackup\Myserver\Acronis\Backup1_2013_05_03_00_31_08_941D.TIB"
Compression: Normal
Exclude: Files matching mask
Match criterion: C:\Backup1; ...
Ask for the first media: No

5 Information 5/3/2013 6:18:23 AM Pending operation 155 started: 'Creating partition image'.
6 Information 5/3/2013 6:19:01 AM Locking partition C:...
7 Error 5/3/2013 6:25:56 AM Operation with partition '0-0' was terminated.
Details:
Failed to create volume snapshot.

Error code: 0x70021
$module = "disk_bundle_vs_32308"
Tag: 0xA5695862AAF8E699
Failed to start creating the volume snapshot.

Error code: 0x10C442
$module = "disk_bundle_vs_32308"
Tag: 0x14181C22EF45B107
The shadow copy provider timed out while flushing data to the volume being shadow copied. This is probably due to excessive activity on the volume. Try again later when the volume is not being used so heavily.

Error code: 0x9
code = 2,147,754,771 (0x80042313),
$module = "disk_bundle_vs_32308"
Tag: 0x2AACB7B2AB852AC
Additional info:
--------------------
Error code: 502
Module: 1
LineInfo: a164035b3ff39287
Fields: $module : disk_bundle_vs_32308
Message: Operation with partition '0-0' was terminated.
Details:
Failed to create volume snapshot.

Error code: 0x70021
$module = "disk_bundle_vs_32308"
Tag: 0xA5695862AAF8E699
Failed to start creating the volume snapshot.

Error code: 0x10C442
$module = "disk_bundle_vs_32308"
Tag: 0x14181C22EF45B107
The shadow copy provider timed out while flushing data to the volume being shadow copied. This is probably due to excessive activity on the volume. Try again later when the volume is not being used so heavily.

Error code: 0x9
code = 2,147,754,771 (0x80042313),
$module = "disk_bundle_vs_32308"
Tag: 0x2AACB7B2AB852AC
--------------------
Error code: 33
Module: 7
LineInfo: a5695862aaf8e699
Fields: $module : disk_bundle_vs_32308
Message: Failed to create volume snapshot.
--------------------
Error code: 50242
Module: 16
LineInfo: 14181c22ef45b107
Fields: $module : disk_bundle_vs_32308
Message: Failed to start creating the volume snapshot.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 2147754771, $module : disk_bundle_vs_32308
Message: The shadow copy provider timed out while flushing data to the volume being shadow copied. This is probably due to excessive activity on the volume. Try again later when the volume is not being used so heavily.
--------------------
8 Error 5/3/2013 6:25:56 AM Command 'Backing up' has failed.
Additional info:
--------------------
Error code: 61
Module: 309
LineInfo: 4a8728dc8a1c950f
Fields: $module : service_process_vs_32308
Message: Command 'Backing up' has failed.
--------------------
Error code: 3
Module: 329
LineInfo: 1cd98aae889424f9
Fields: $module : disk_bundle_vs_32308
Message: Backup has failed.
--------------------
Error code: 1060
Module: 1
LineInfo: b43e776571144dec
Fields: $module : disk_bundle_vs_32308
Message: Failed to commit operations.
--------------------
Error code: 33
Module: 7
LineInfo: a5695862aaf8e699
Fields: $module : disk_bundle_vs_32308
Message: Failed to create volume snapshot.
--------------------
Error code: 50242
Module: 16
LineInfo: 14181c22ef45b107
Fields: $module : disk_bundle_vs_32308
Message: Failed to start creating the volume snapshot.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 2147754771, $module : disk_bundle_vs_32308
Message: The shadow copy provider timed out while flushing data to the volume being shadow copied. This is probably due to excessive activity on the volume. Try again later when the volume is not being used so heavily.
--------------------
Task 'Differential backup' has failed on machine 'Myserver'.