Excel files are not safe, as in you can't know what changed between two versions of a sheet, and because usually many things change between two versions of a sh

Excel files are not safe, as in you can't know what changed between two versions of a sheet, and because usually many things change between two versions of a sheet. So Excel sheets are very prone to having mistakes in them. It's usually fine when you have a few sheets handled by a few people. But when sheets start to pile up and people leave, then these errors tend to accumulate, leading to actual financial risks.