Task 'Debian Full' has failed on machine 'AcronisAppliance'.

Backup has failed. Please check the log for additional information.
1 Information 4/18/16 9:15:01 PM Task 'Debian Full' changed its state from 'idle' to 'running'.
2 Information 4/18/16 9:15:01 PM Task 'Debian Full' was started.
3 Information 4/18/16 9:15:01 PM Backing up VM(s).
4 Information 4/18/16 9:15:02 PM Successfully connected to 'VMware vCenter Server 5.5.0 build-2001466'.
5 Information 4/18/16 9:15:02 PM Successfully connected to 'VMware ESXi 5.5.0 build-1623387' through VMware vCenter Server.
6 Information 4/18/16 9:15:02 PM Successfully connected to 'VMware ESXi 5.5.0 build-1331820' through VMware vCenter Server.
7 Information 4/18/16 9:15:02 PM Successfully connected to 'VMware ESXi 5.5.0 build-1331820' through VMware vCenter Server.
8 Information 4/18/16 9:15:02 PM Successfully connected to 'VMware vCenter Server 5.5.0 build-2001466'.
9 Information 4/18/16 9:15:03 PM Failed to write to file 'avfs:/smb?//bisqnap/Virtiual%20Machine/Debian/966971BA-3BF5-4FE8-BA2A-DF421E07896F'.
Additional info:
--------------------
Error code: 26
Module: 146
LineInfo: 4d7f75fcde07d78d
Fields: IsReturnCode : 1
Message: Failed to write to file 'avfs:/smb?//bisqnap/Virtiual%20Machine/Debian/966971BA-3BF5-4FE8-BA2A-DF421E07896F'.
--------------------
Error code: 12
Module: 4
LineInfo: 3d9ea26f1bfdf083
Fields:
Message: The file is read-only.
--------------------
Error code: 65521
Module: 0
LineInfo: bd28fdbd64edb8d0
Fields: code : 30
Message: Read-only file system
--------------------
10 Information 4/18/16 9:15:03 PM Successfully connected to 'VMware vCenter Server 5.5.0 build-2001466'.
11 Information 4/18/16 9:15:03 PM Successfully connected to 'VMware ESXi 5.5.0 build-1623387' through VMware vCenter Server.
12 Information 4/18/16 9:15:03 PM Successfully connected to 'VMware ESXi 5.5.0 build-1331820' through VMware vCenter Server.
13 Information 4/18/16 9:15:10 PM Creating snapshot (4/18/16 9:15:04 PM).
14 Information 4/18/16 9:15:10 PM Loading virtual machine 'vm://E700EAA4-59DD-40FC-8BFA-12B859E92816/50141814-8f18-01e7-8684-8d303cc372bb?host=host-47&type=vmwesx' into the disk subsystem.
15 Information 4/18/16 9:15:10 PM Opening virtual disk '[datastore 102] Debian Server Live/Debian Server Live.vmdk' via network because it's located on directly inaccessible storage.
16 Information 4/18/16 9:15:10 PM VMware_VDDK: SSL_VerifyX509: Certificate verification is disabled, so connection will proceed despite the error
17 Information 4/18/16 9:15:10 PM VMware_VDDK: SSL_VerifyX509: Certificate verification is disabled, so connection will proceed despite the error
18 Information 4/18/16 9:15:12 PM Analyzing partition 'C:'...
19 Information 4/18/16 9:15:12 PM Analyzing partition '1-5'...
20 Information 4/18/16 9:15:12 PM Analyzing partition '1-0'...
21 Error 4/18/16 9:15:13 PM Failed to open the archive for appending changes.
Additional info:
--------------------
Error code: 4
Module: 64
LineInfo: 3f26773fab7bd98f
Fields: path : avfs:/smb?//bisqnap/Virtiual%20Machine/Debian/
Message: Failed to open the archive for appending changes.
--------------------
Error code: 18
Module: 4
LineInfo: 2ec441f255ed364b
Fields:
Message: This is not the last volume of the backup archive.
--------------------
22 Error 4/18/16 9:15:13 PM Failed to open the archive for appending changes.
Additional info:
--------------------
Error code: 4
Module: 64
LineInfo: 3f26773fab7bd98f
Fields: path : avfs:/smb?//bisqnap/Virtiual%20Machine/Debian/
Message: Failed to open the archive for appending changes.
--------------------
Error code: 18
Module: 4
LineInfo: 2ec441f255ed364b
Fields:
Message: This is not the last volume of the backup archive.
--------------------
23 Error 4/18/16 9:15:13 PM Failed to open the archive for appending changes.
Additional info:
--------------------
Error code: 4
Module: 64
LineInfo: 3f26773fab7bd98f
Fields: path : avfs:/smb?//bisqnap/Virtiual%20Machine/Debian/
Message: Failed to open the archive for appending changes.
--------------------
Error code: 18
Module: 4
LineInfo: 2ec441f255ed364b
Fields:
Message: This is not the last volume of the backup archive.
--------------------
24 Error 4/18/16 9:15:13 PM The operation 'Backing up' has failed.
Additional info:
--------------------
Error code: 26
Module: 100
LineInfo: 48afbd3608a410ca
Fields:
Message: The operation 'Backing up' has failed.
--------------------
Error code: 1080
Module: 1
LineInfo: 145a191bfe9050d1
Fields:
Message: Failed to execute the operation.
--------------------
Error code: 1080
Module: 1
LineInfo: bb03ce40e9a37fb0
Fields:
Message: Failed to open archive.
--------------------
25 Information 4/18/16 9:15:13 PM Remove snapshot (snapshot-8206).
26 Information 4/18/16 9:15:13 PM Task 'Debian Full' changed its state from 'running' to 'idle'.
27 Error 4/18/16 9:15:13 PM Task 'Debian Full' failed: 'Failed to create a backup.
Additional info:
--------------------
Error code: 3
Module: 435
LineInfo: 555b5abba0950340
Fields:
Message: Failed to create a backup.
--------------------
Error code: 32786
Module: 114
LineInfo: 28314c961de7d337
Fields:
Message: Failed to prepare for backing up.
--------------------
Error code: 353
Module: 149
LineInfo: a71592046cb2c5f6
Fields:
Message: Failed to back up the group.
--------------------
Error code: 2
Module: 218
LineInfo: 338a407ad20e0987
Fields:
Message: Error occurred while running the backup and recovery engine.
--------------------
Error code: 1080
Module: 1
LineInfo: 145a191bfe9050d1
Fields:
Message: Failed to execute the operation.
--------------------
Error code: 1080
Module: 1
LineInfo: bb03ce40e9a37fb0
Fields:
Message: Failed to open archive.
--------------------'.