In D:OS2 in the options menu there are two sliders: One for quick saves and one for auto saves and you could chose how many you want to have, somewhere between 1 and 99 I think.

 

I think it would be nice to have this in PoE too. I think in PoE2 when you do a quick save in a new area it creates a new save file but if you do a quick save in an area where you already have a quick save the old one will be overwritten.

 

I think you should have X auto and quick saves and you should be able to select X. Until you have X files it will create a new one and when you have X files you should overwrite the oldest file, independent on the area you are now or the area where the old save has been made.

 

Of course you can make as many manual saves as you want and they get only overwritten or deleted if you do it manually.

If this is easy to be implemented, it seems like a really good idea, but at this point, if it takes significant time away from from bug fixing/balancing, I don't think it's worth it.