Here's a procedure that may be better for testing this without the VM/hard reset induced gap. Basically run the backups manually from command prompt. Then after applying the patch, halt to stop cleanly. Using halt should be more UFS friendly than doing a dirty/hostile hard reset. Whereas ZFS doesn't seem to mind the hard reset.
Enable RAM Disk
Percolate some monitoring data for a few minutes.
Run the backups manually from console command prompt.
/etc/rc.backup_aliastables.sh
/etc/rc.backup_dhcpleases.sh
/etc/rc.backup_rrd.sh
Apply the patch.
playback gitsync –minimal --diff --show-files git://github.com/NOYB/pfsense.git RAM_Disk_Management
Stop and restart so the system upgrades.
halt
Check upgrade result.
a) Verify monitoring graphs and RAM disk backup files.
b) Reboot
c) Verify monitoring graphs and RAM disk backup files.