what if something break on your laptop where you have critical informations?
I was serious when I wrote this:Or use a screwdriver, as that's all it takes to take out the drive.
What if your power supply breaks on your laptop?
I'd probably fix it myself 
Quote
Can you trust your repair shop will not duplicate your hdd?
You can assume this, but you can only be sure if you don't let your HDD out of sight.Quote
When I gave my phone to repair shop, I resettled it to factory setting, but had the luxury of being able to prepare for the event.
What should you do in case of an “ unforeseeable” event?
Phones are much worse: you can't just take out the disk to send it in for repairs. But phones are also much more likely to get stolen, so I'd say don't store more data on it than you're willing to lose.What should you do in case of an “ unforeseeable” event?