During course of backup it errors out with following syntax error "Failed to open connection on port 49152"
Putty into the esx host where the vm currently lives and cd to the vm's folder.
You should be able to remove the log files, except for the most current one (see time stamp) that is being used by the vm.
The .vzsnp files may be left overs from a backup that failed midstream and where the esxRangerprocli.exe's were terminated before they could complete. In a normal backup we will remove the copy files we create (.vzsnp) at the end of the backup cycle. If this is interrupted prematurely the command to delete these files is not sent.
To clean up the files with .vzsnp extension
Putty into the esx host where the vm currently lives and cd to the vm's folder.
This removes the copy files we created