I buried all my important documents but then I forgot where I buried them! Glad IRS has all that information backed up!...
I have large safe that holds guns and most important documents. I would not recommend a digital lock or a Key backup. Check youtube for safe cracking there are all types of tools and techniques for defeating those locks... I would go with a old fashioned combination lock with no key backup and don't loose the combination.
I added security cameras to the house. I will get a email or text on my smart phone if cameras sense movement. I can see the activity on my smart phone and visit the cameras in real time and I can then act accordingly.
I also would not recommend putting sensative information on your computer. It would be a real mega source of information for a ID theif if your computer gets stolen.. Storing on a thumb drive and store thumb drive in fire proof safe would be good. Would not destroy paper backup. Being a retired cop it makes the hair on my neck standup.
Currently working on surveilance camera for RV so we can see what's happening when we are not there... Just because your not paranoid does not mean everyone is not out to get you!