An administrator uses vCenter Data Recovery to make backups of virtual machines. Checking on the backup jobs run the previous evening, the administrator notices some jobs completed while others did not. Which of the following are possible causes for the failure?

A.
Four backup jobs were running simultaneously, causing new jobs to fail to start

B.
CPU utilization on one or more ESX Hosts exceeded 90 percent prior to one or more jobs executing

C.
Compress the virtual machine files before the backup job runs.

D.
Four restore jobs were running simultaneously, causing new jobs to fail to start

Explanation:
VMware Data Recovery Administrator’s Guide, page 7.
Backing Up Virtual Machines
During a backup, Data Recovery creates a quiesced snapshot of the virtual machine. Deduplication is automatically performed with every backup operation. Data Recovery can concurrently back up a maximum of eight virtual machines. To start multiple backups, CPU utilization must be less than 90 percent.