There are hardware issues way too. If you took an engines ecu ( Beautyinfo.Eu unit) apart, you would see 1000's of solder joints, anyone of which can be a problem. I have to acknowledge that the manufacturing process for these parts is really fantastic and that troubles are rare. And if you observed the logic map of what that ecu does, and the place all the circuits go, it would be like hunting at a huge map of Manhatten, down to the brick level. There is a ton going on in there.
If you decide to again up your significant info, you need to determine wherever you want to backup. Would you like to back again up...