Dont agree with the you at all
It certainly is not eggs in one basket,the chances of two disks destructing at the same time are very small indeed.
Whats blunt force trauma-a hippo falling on it?
Its like insurance-if you are a belt and braces type, you no doubt will insure against a giraffe falling from the sky and injuring you.!
Can't see any logic whatsoever to your strange statement that "The farther away the backup data is, the safer it is".
Its actually worse because the connections aren't as efficient as the internal ones,certainly with USB and in my case- had problems downloading and restoring with it.
Therefore the dangers of a corrupted restore are greater.
It still is going to be stolen (unless you take it with you ),burn in case of fire and if connected to the computer,be damaged if the other disks are going to be damaged.
The problem with externals in my experience is that they are either connected using USB,which is very slow compared to SATA,or problems may exist as when using Acronis .
In the case of eSATA,there are the occasional incompatibilities with other most unlikely apps. and unless AHCI is the chosen mode will only start on reboot.
Compared to internals,they also have size limitations and are not cooled as well.
In case of burglary to use your sort of unlikely scenario,an external may be the first thing to go ,before the computer itself.
Lets not get pedantic here-if a fire happened within the computer (which Ive never heard of)and no one was present,in all probability the external would also be destroyed.
But no doubt the majority of users are happy with externals.
You are saying that the long accepted practice of a spare internal disk for backups is wrong.
Re TODO check its Forum-there are problems with faulty disk sectors,but all in all its good.
I have used it quite a bit and for freeware has great potential,but probably would classify the current version as a Beta.
In any case, if you are prepared to pay,there are certainly better alternatives