LOL I see what you did there

I have a somewhat general question actually.
Not solely related to this coin.
But I am one of those sorry souls who actually mined bitcoins back when it was possible to do on cpu.
As far as I can recall, I was solo mining directly from wallet. And I think that GPU-mining was still in a beta/experimental stage. All I remember for sure is that the interface looked something like the old dos defragmentation that sometimes happened after a crash on say windows 95. Lots and lots of red squares and every once in a while a whole screen of green ones. So something tells me that I've actually managed to hit at least a couple of blocks.
The sad thing though is that when my old computer died, I did try to back-up my wallet. But I´ve only managed to save the "somecredentials".wallet and not the actual wallet.dat. I am not sure whether I simply did not know any better or if maybe it was hidden by windows as a hidden file. Either way, it's gone. Harddrive had the nail+hammer treatment and is now in some landfill somewhere. I have also searched through every tiny slit of paper in my "paperslit-storage" for the chance to find a mnemonic-seed but to no avail.
I have sort of come to terms with this now, and am actually happy that I don't remember how many, if any, bitcoins I actually managed to mine.
So I guess you can grasp how I would very much like to never make the same mistake again.
TL;DR - My question is. If I backup my wallet.dat from any given crypto-currency today. Will it then be enough to restore funds that are mined after said backup?
I'm guessing the answer is yes but I really want to make sure :-)