You're not the first one to spot that
Surprisngly it's not co-ordinates, but actually the motion of a Lantern Jack projectiles in both the X and Y direction. It'll be more noticeable when you find an elite one, which shoots 5 of them at you, and you'll get the message 5 times.
In regards to the backups, don't worry - I find it complicated as well. In the backups folder of your characater, you'll find a .cha and .wld file, both with the same name. What you'll need to do is, if we want to restore the character into the 6th slot (as I'll assume you have that one empty for now) we want to take these files and rename them so they are called 5.cha and 5.wld. You then want to select both of them, and I would suggest copying or cutting them and putting them in your Secrets of Grindea folder.
You then want to take the 5.cha file and drag it into the folder named "Characters", and take the 5.wld file and put it in the folder named "Worlds". My understanding is that the .cha file contains all the stuff and skills your character has accumulated, and the .wld file contains all the quests you've completed and the place you are in the story.
I hope that helped. If you need to use a different slot, take this rule and use it for the number you rename the files to:
(number of file slot you want) - 1 = number to rename files to.
Bear in mind this counts the slots as going down the column, then across to the next row and down that column, and so on. The reason for this discrepancy is to do with programming. Often, programming languages like to use a system known as "zero-based numbering". This means that numbers start from a 0 rather than a 1. This conflicts with most non-programming circumstances, and may have something to do with 0 being discovered/invented quite late in our history of maths (even after negative numbers and fractions, I think).