I really don't know exactly what files are covered by the VRDB, but it isn't a back-up as in a copy of the file or the size of the VRDB database would be huge as it keeps three generations of the database. It retains only enough information to try and repair the file.
However, as I have said infections that use encryption that changes is trying to combat the ability of any AV to repair it and that doesn't apply just to avast. The VRDB function was when introduced a very useful tool but that use with the development of malware is limited and as far as I'm aware from avast 5 the VRDB won't be continued.
It has nothing to do with not accepting what you did or didn't do, by disabling avast to start with you didn't test the anti-viruses ability to protect you in the first place and once infected by one of the most virulent file infecters that has resulted in many having to format and reinstall and that isn't just avast users all you need to do is check the various anti-malware sites to see that.
You don't seem to want to accept that what you did was plainly stupid, sorry, but I have no other words for it.