So far I've never lost anything - its just the inconvenience of disconnecting the HDD and hooking it up to a Windows PC for a repair. If I had the money (I don't) I'd be happy to have the house rewired and buy new kit & a NAS to run gigabit .
In my case its probably hundreds of hours - still a lot to repeat. I'd class myself as the first type of user but I operate with a restricted budget so only one backup.
Maybe you should decide exactly what you’re trying to achieve and take it from there.
As you didn’t indicate how you are running LE I’m assuming you’re a Windows user and reluctant to cut the chord. If that indeed is the case it’s been pointed out to you the dangers of mixing Windows and Linux file systems on a number of occasions. Who the hell wants to be constantly swapping in and out a HDD to repair it.
There are acres of discussions on the web about the pros and cons of each of the file systems and no definitive winner. What is obvious though is an HDD with an NTFS file system is not an ideal choice for LE.
One thing is for sure. LE is a Linux based OS and Linux based file systems are what you should be targeting.
Maybe get an identical HDD and format it Ext4 and copy the contents of your NTFS HDD to it and that takes all the wondering out of the equation.
Either way good luck with that setup. You did mention that you’ve lost no data so far but it sounds like that event could be closer than you think on your current trajectory.