Backup failed

The article https://kb.acronis.com/content/31418 describes this problem and possible solutions.

Thank you for the information. The C drive is a half full 250GB SSD, so to provide more temporary storage for the VSS file I changed the path to the external backup drive X which is a 8TB raid array. The backup now says that it is completing but with warnings. The 2 warnings I am still getting is :

--------------------
Log Entry Details
--------------------
Type: Warning
Date and time: 8/2/2014 12:43:07 PM
Backup plan: Daily Data Incremental Backup to ISS
Task: Incremental backup
Code: 4,195,020(0x4002CC)
Module: 64
Owner: ServerAdmin@SOLARSYSTEM
Message:
Failed to take a VSS snapshot.
Additional info:
--------------------
Error code: 716
Module: 64
LineInfo: fdc1cbdf2c233430
Fields: $module : disk_bundle_vs_38573
Message: Failed to take a VSS snapshot.
--------------------
--------------------
and

--------------------
Log Entry Details
--------------------
Type: Warning
Date and time: 8/2/2014 12:43:05 PM
Backup plan: Daily Data Incremental Backup to ISS
Task: Incremental backup
Code: 1,098,823(0x10C447)
Module: 16
Owner: ServerAdmin@SOLARSYSTEM
Message:
Failed to create a snapshot of volume 'P: (\Device\HarddiskVolume6)'.
Additional info:
--------------------
Error code: 50247
Module: 16
LineInfo: 14181c22ef45b0cc
Fields: $module : disk_bundle_vs_38573
Message: Failed to create a snapshot of volume 'P: (\Device\HarddiskVolume6)'.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 50, $module : disk_bundle_vs_38573
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8e0
Fields: code : 2147942450, $module : disk_bundle_vs_38573
Message: The request is not supported
--------------------
--------------------

Is P: a system reserved partition? There are problems with making VSS snapshot of it ( http://answers.microsoft.com/en-us/windows/forum/windows_7-system/syste… ) . Most likely in this case Acronis Backup will create snapshot of this partition (and backup it) without VSS, which is not a problem as is doesn't host VSS-aware applications. You can check that its files are included in backup if you open the archive for restore 'as files'.
If it's not, you can create another test backup without using VSS to check that it's indeed VSS problem, then use VSS troubleshooting article - https://kb.acronis.com/content/36200 .

If Acronis VSS provider is chosen in backup plan options, try to use Microsoft VSS instead (this corresponds to 'Software-System provider' option value)

The P drive is an internal 7.4 TB raid array used for all domain users data. The backup failed again last night here are the logs from the email notification:
--------------------
Log Entry Details
--------------------
Type: Warning
Date and time: 8/2/2014 12:43:05 PM
Backup plan: Daily Data Incremental Backup to ISS
Task: Incremental backup
Code: 1,098,823(0x10C447)
Module: 16
Owner: ServerAdmin@SOLARSYSTEM
Message:
Failed to create a snapshot of volume 'P: (\Device\HarddiskVolume6)'.
Additional info:
--------------------
Error code: 50247
Module: 16
LineInfo: 14181c22ef45b0cc
Fields: $module : disk_bundle_vs_38573
Message: Failed to create a snapshot of volume 'P: (\Device\HarddiskVolume6)'.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 50, $module : disk_bundle_vs_38573
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8e0
Fields: code : 2147942450, $module : disk_bundle_vs_38573
Message: The request is not supported
--------------------
--------------------

I ran it again just now and it failed again. Here are the logs form that:

Failed to execute the command.
Additional info:
--------------------
Error code: 41
Module: 307
LineInfo: e6792a5ee190dda6
Fields: $module : agent_protection_addon_vs_38573
Message: Failed to execute the command.
--------------------
Error code: 3
Module: 329
LineInfo: 1cd98aae889424f9
Fields: $module : disk_bundle_vs_38573
Message: Backup has failed.
--------------------
Error code: 1060
Module: 1
LineInfo: b43e776571144dee
Fields: $module : disk_bundle_vs_38573
Message: Failed to commit operations.
--------------------
Error code: 33
Module: 7
LineInfo: df81da2c74ec50d5
Fields: $module : disk_bundle_vs_38573
Message: Failed to create volume snapshot.
--------------------
Error code: 50254
Module: 16
LineInfo: 14181c22ef45ae0f
Fields: blocks : 1953478911, $module : disk_bundle_vs_38573
Message: Failed to set snapshot bitmap.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 8, $module : disk_bundle_vs_38573
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8e0
Fields: code : 2147942408, $module : disk_bundle_vs_38573
Message: Not enough storage is available to process this command
--------------------

I can't suggest something new. If possible, collect diagnostics information per VSS troubleshooting article ( https://kb.acronis.com/content/36200 .) and contact the support.