Error in some backups

Hello,

i’m having trouble in some agents. See the log:

Report:
( 19 infos, 4 warnings, 0 errors )

2017-05-08 11:01:45(info): Starting scheduled incremental file backup…
2017-05-08 11:02:21(info): Selected no components to backup
2017-05-08 11:02:21(warning): Writer System Writer has failure state VSS_WS_FAILED_AT_FREEZE with error VSS_E_WRITERERROR_TIMEOUT. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-08 11:02:21(warning): Writer MSSearch Service Writer has failure state VSS_WS_FAILED_AT_FREEZE with error VSS_E_WRITERERROR_TIMEOUT. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-08 11:02:21(warning): Writer WMI Writer has failure state VSS_WS_FAILED_AT_FREEZE with error VSS_E_WRITERERROR_TIMEOUT. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-08 11:02:21(warning): Writer BITS Writer has failure state VSS_WS_FAILED_AT_FREEZE with error VSS_E_WRITERERROR_TIMEOUT. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-08 11:02:21(info): Scanning for changed hard links on volume of "C:"…
2017-05-08 11:02:21(info): Following symbolic link at “C:\Users\cpu\Documents\Meus Vídeos” to “C:\Users\cpu\Videos” confirms symlink backup target “.symlink_Videos” to “C:\Users\cpu\Videos”
2017-05-08 11:02:21(info): Following symbolic link at “C:\Users\cpu\Documents\Minhas Imagens” to “C:\Users\cpu\Pictures” confirms symlink backup target “.symlink_Pictures” to “C:\Users\cpu\Pictures”
2017-05-08 11:02:21(info): Following symbolic link at “C:\Users\cpu\Documents\Minhas Músicas” to “C:\Users\cpu\Music” confirms symlink backup target “.symlink_Music” to “C:\Users\cpu\Music”
2017-05-08 11:02:21(info): Indexing of “Documents” done. 2 filesystem lookups 865 db lookups and 1 db updates
2017-05-08 11:02:21(info): RH2: Loading file list…
2017-05-08 11:02:21(info): RH2: Calculating file tree differences…
2017-05-08 11:02:21(info): RH2: Calculating tree difference size…
2017-05-08 11:02:21(info): RH2: Linking unchanged and loading new files…
2017-05-08 11:02:26(info): Waiting for file transfers…
2017-05-08 11:02:29(info): Waiting for file hashing and copying threads…
2017-05-08 11:02:30(info): Saving file metadata…
2017-05-08 11:02:30(info): Writing new file list…
2017-05-08 11:02:30(info): All metadata was present
2017-05-08 11:02:32(info): Transferred 763.754 KB - Average speed: 727.176 KBit/s
2017-05-08 11:02:35(info): Time taken for backing up client RH2: 50s
2017-05-08 11:02:35(info): Backup succeeded

Like this too:

Report:
( 16 infos, 4 warnings, 0 errors )

2017-05-07 20:04:56(info): Starting scheduled incremental file backup…
2017-05-07 20:05:04(warning): Writer BITS Writer has failure state VSS_WS_STABLE with error VSS_E_WRITERERROR_OUTOFRESOURCES. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-07 20:05:04(warning): Writer BITS Writer has failure state VSS_WS_STABLE with error VSS_E_WRITERERROR_OUTOFRESOURCES. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-07 20:05:04(warning): Writer BITS Writer has failure state VSS_WS_STABLE with error VSS_E_WRITERERROR_OUTOFRESOURCES. UrBackup will continue with the backup but the associated data may not be consistent.
2017-05-07 20:05:04(warning): Writer is in error state during snapshot creation. Writer data may not be consistent. This means the files open by this application (e.g. databases) will be backed up in a crash consistent state instead of a properly shutdown state. Properly written applications can recover from system crashes or power failures.
2017-05-07 20:05:04(info): Scanning for changed hard links on volume of "c:"…
2017-05-07 20:05:04(info): Indexing of “MICROSIGA” done. 6 filesystem lookups 680 db lookups and 5 db updates
2017-05-07 20:05:04(info): Indexing of “Backup” done. 1 filesystem lookups 2 db lookups and 0 db updates
2017-05-07 20:05:04(info): Totvs: Loading file list…
2017-05-07 20:05:04(info): Totvs: Calculating file tree differences…
2017-05-07 20:05:04(info): Totvs: Calculating tree difference size…
2017-05-07 20:05:04(info): Totvs: Linking unchanged and loading new files…
2017-05-07 20:12:14(info): Waiting for file transfers…
2017-05-07 20:12:17(info): Waiting for file hashing and copying threads…
2017-05-07 20:12:20(info): Saving file metadata…
2017-05-07 20:12:26(info): Writing new file list…
2017-05-07 20:12:27(info): All metadata was present
2017-05-07 20:25:11(info): Transferred 711.234 MB - Average speed: 13.7708 MBit/s
2017-05-07 20:25:16(info): Time taken for backing up client Totvs: 20m 23s
2017-05-07 20:25:16(info): Backup succeeded

What that means?

Server version: 2.1.19 CentOS 7
Client version: 2.1.15 Windows 2008 R2 and Windows 8.1