Client had legacy Windows NT application (not connected to Internet, but running legacy system) that was running on VMWARE ESXi.

Client wanted to migrate to KVM/qemu however the old physical system had IDE emulation via Adaptec SCSI->IDE. And client had created the VMWARE emulation the same way. Thus when the VM was converted from VMWARE to KVM/qemu the system would not eboot. Got the infamous BSOD with "INACCESSIBLE BOOT DEVICE" error as it was looking for a SCSI drive controlled as IDE by an adaptec driver that didn't exist anymore.

Incremental full VM backups from running systems. 

Setup scripts to increment through all VMWARE VMS that needed to be backed up and sent to NFS share attached to removable hot-swap (USB attached) spinning disk media.

Setup 7 day rotation and monthly backup schedule to allow full backups and to have quick and easy removal/replacement of media for offsite storage of complete daily snapshots of VMs.