I backed up my last iPhone a few months ago, before purchasing a new XR so I could move all of the info from my past phone on to the new one. At the Apple Store, I ended up just connecting the two phones together to do the data transfer, so I didn't end up needing the iTunes backup from my PC after all.
Fast forward to last week, my iPhone stopped working, and since shelter in place is still in full effect in CA, I had to send my phone in and they sent me a new replacement today. Since it stopped working suddenly, I wasn't able to get my current data back, but I fortunately still have the backup I made in February. Problem is, it is asking for a decryption pass code that I never created (at least not within the last 10 years).
I have called Apple Support, and they told me that they have no way of accessing or resetting this password, does anyone have any idea what it could have been? Could it have been a password that I entered when I first setup my Apple ID in 2008? Could it have been a password I set on another computer?
This backup contains years of photos of travelling, life events, and moments with those who have passed away. Any help would be graciously appreciated.