Backup fails with 'Child process died unexpectedly' (90674)

Backup failing with 'Child process died unexpectedly' the binary log shows the following entries:

Information 2012/03/27 11:13:00 1235 Schedule Bakbone Starting phase 1 on RW524
Error 2012/03/27 11:13:21 1235 Jobs Bakbone Cannot gain network access to client machine
Error 2012/03/27 11:13:21 1235 Jobs Bakbone Fatal error: Failed to start plugin

Information 2012/03/27 11:44:00 1235 Schedule Bakbone Starting phase 1 on RW524
Job Message 2012/03/27 11:44:00 1235 Jobs Bakbone Starting job 1235 'rw524 Incremental System Backup' (Phase 1 , Instance 123) for UID 1

Error 2012/03/27 11:47:58 1235 Jobs Bakbone The client machine is down
Error 2012/03/27 11:47:58 1235 Jobs Bakbone Fatal error: Failed to start plugin

There are a number of reasons a client can be unaccessable. In this example, a very busy server where the CPU was running at 100% there it was not possible for the client to be conacted when doing a check access and not possible to browe the file system APm on the client, hence the jobs failed as the APM could not be started

This issue was resolved by decreasing the ammount of CPU cycles the primary software package consumed on the client..