@burnout426: Thank you for your suggestions. I might try that once my schedule is open (very busy month).
Though I was installing "stable" version in hopes of it being actually stable. If I wanted to test and debug Opera, I'd go for beta version. Like wasn't that the reason of all those branches existing in the first place?
@pavelopdev: I find Opera being a lot useful actually. Was.. In my opinion "crash culprit" is Opera 74 itself, as 73 was actually stable in that regard. And I don't really have the time to investigate it properly, simply because another browser manages to do the same without crashing. Maybe later.
Though thanks for the idea of using backup software, I don't use that due to my PC and OS being stable without any repairs and reinstallations for more than 2 years (along with that Opera profile, though had to "manually repair" it few times due to rollback) and having all work related stuff on another drive.