Speed Up Time machines First back up

Hi I am trying to complete Times machines first back up Basically is starting again after a corruption of the original file. Have wipe my Back up Nas and started from scratch the problem my First back up is 2.8TB its going to take weeks at the rate it is working at approx 50 gigs ad day

Needless to say there are too many potential pitfalls to keeping the mach running this long as a my main production unit some app can require a restart and bang I am back at the beginning again.

I really need to find a way to speed the whole process up just for this initial back up . I have found this site http://www.mackungfu.org/massively-speed-up-time-capsule-time-machine-backups

Massively speed up Time Machine backups

basically its saying

Open a Terminal window, which you’ll find in the Utilities folder within the Applications list, and paste in the following, typing your login password when prompted:

sudo sysctl debug.lowpri_throttle_enabled=0

This command prevents Time Machine’s backup process assuming a low CPU priority, allowing backups to complete insanely quickly. In fact, you’ll see MB and GBs tick past on the Time Capsule progress display in a second-by-second fashion (provided your Mac isn’t very busy with some other task).

can anyone comment on this is it safe to do and will it help my situation