if you bought or formatted an NTFS drive it either came with software or you downloaded something
there is NOTHING out of the box in any version of OS X that allowed you to write to an NTFS
that being said I've used paragon with a seagate drive that shipped NTFS but reformatted the drive quickly after. It never worked on any other Seagate NTFS drive after so unless you buy something that is a all drive NTFS solution with Mac OS it may not work if it was a proprietary bundle.
Secondly check the forums for those products and see what people said.
The "Days" it takes to backup that drive and reformat it might be worth it if an update breaks something and you have a 2TB read only monolith on your desk. Also you can no backup to or from an NTFS drive with TimeMachine.
In a sense if you need the drive NTFS and you need to write to it; connect to a windows PC and enable file sharing and use it from the mac with no restrictions, no need to research updates and no other software to buy or pay for updates later on as it will be native to the windows box its connected to and the mac won't care what format it's in.