It is fast, a one time fee — drive ~ $80 for ample disk space (1TB).
I'd guess that you would be protected with the online service if your house burned down. But the connection to the Internet is going to be slow. Much slower than a local harddrive.
Might I also suggest a copy of Acronis True Image or comparable software to go along with it?
Saved my butt on more than one occasion.
That’s the advice I would have given. I back up system once a month onto a USB drive. Special Docs I’ll make a thumbwheel copy just in case. MY HD is 250GB the backup using Windows Back up takes about an hour.