Backup Constantly Failing Due to Index Errors and Backup Errors

Server: Windows 2008 R2 Server
Client: Windows Server 2003 R2

Client Error Logs:

Indexing files failed, because of error
Constructing of filelist of “fileserver1” failed: error - stopped indexing
Backup had errors. Deleting partial backup.

Indexing files failed, because of error
Constructing of filelist of “fileserver1” failed: error - stopped indexing
Backup had errors. Deleting partial backup.
Exponential backoff: Waiting at least 40m before next file backup

Starting full file backup…
Indexing files failed, because of error
Constructing of filelist of “fileserver1” failed: error - stopped indexing
Backup had errors. Deleting partial backup.
Exponential backoff: Waiting at least 40m before next file backup

2014-12-04 05:46:32: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:32: rc=0 hasError=true state=0
2014-12-04 05:46:32: Started connection to SERVICE_COMMANDS
2014-12-04 05:46:32: ClientService cmd: #(string_removed)#2PING RUNNING pc_done=0&eta_ms=300658952845#token=(string_removed)
2014-12-04 05:46:32: rc=0 hasError=true state=0
2014-12-04 05:46:32: SERVICE_COMMANDS finished
2014-12-04 05:46:33: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:33: rc=0 hasError=true state=0
2014-12-04 05:46:34: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:34: rc=0 hasError=true state=0
2014-12-04 05:46:35: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:35: rc=0 hasError=true state=0
2014-12-04 05:46:36: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:36: rc=0 hasError=true state=0
2014-12-04 05:46:37: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:37: rc=0 hasError=true state=0
2014-12-04 05:46:38: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:38: rc=0 hasError=true state=0
2014-12-04 05:46:39: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:39: rc=0 hasError=true state=0
2014-12-04 05:46:40: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:40: rc=0 hasError=true state=0
2014-12-04 05:46:41: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:41: rc=0 hasError=true state=0
2014-12-04 05:46:42: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:42: rc=0 hasError=true state=0
2014-12-04 05:46:42: Started connection to SERVICE_COMMANDS
2014-12-04 05:46:42: ClientService cmd: #(string_removed)#2PING RUNNING pc_done=0&eta_ms=300658942798#token=(string_removed)
2014-12-04 05:46:42: rc=0 hasError=true state=0
2014-12-04 05:46:42: SERVICE_COMMANDS finished
2014-12-04 05:46:43: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:43: rc=0 hasError=true state=0
2014-12-04 05:46:44: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:44: rc=0 hasError=true state=0
2014-12-04 05:46:45: ClientService cmd: STATUS DETAIL#pw=(string_removed)
2014-12-04 05:46:45: rc=0 hasError=true state=0

Server Log:

2014-12-04 00:30:28: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\01.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\01.lnk”
2014-12-04 00:30:34: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\02.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\02.lnk”
2014-12-04 00:30:39: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\03.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\03.lnk”
2014-12-04 00:30:43: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\04.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\04.lnk”
2014-12-04 00:30:48: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\05.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\05.lnk”
2014-12-04 00:30:53: WARNING: HT: More hardlink errors. Skipping…
2014-12-04 00:30:58: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\06.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\06.lnk”
2014-12-04 00:31:03: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\A.CMD” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\A.CMD”
2014-12-04 00:31:09: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\Z.bat” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\Z.bat”
2014-12-04 00:31:14: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\Y.bat” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\Y.bat”
2014-12-04 00:31:20: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\X.bat” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\X.bat”
2014-12-04 00:31:24: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\07.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\07.lnk”
2014-12-04 00:31:29: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\08.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\08.lnk”
2014-12-04 04:28:55: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\09.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\09.lnk”
2014-12-04 04:29:01: WARNING: HT: Error creating hardlink from “S:\data_files\urbackup\data_files\141124-0628\data_files\10.lnk” to “S:\urbackup\data_files\141203-1549\Cserver_filesSharesdata_files_C-d09dca41e4\10.lnk”

Thanks in advance.

Can you try and get a client log? See here for more info about the logging: http://www.urbackup.org/administration_manual.html#x1-710009.2