You could just create a separate job for this vm, and turn off the requirement for Tools quiescence. Your backup will only be crash consistent, but it's better than nothing.
Hello All,  We have an EMC ESRS Virtual appliance installed on our VMWare servers and need to have the VMWare tools on this appliance installed. The reason for this is our backup software (veeam) can't communicate with the virtual appliance to take an backup.  Why aren't the tools installed in the appliance by default ? and is it ok if we install the tools ?  I asked this also by EMC chat support, but they refered me to VMWare [IMAGE] as how to install the tools. I know how i must do this but want to know if it is ok to do this or would i break something when installing them ?  Kind regards,  Alex.
ESRS Virtual appliance and vmware tools