which saves are safe to delete

"ambrown;d-958263" wrote:
.VER (followed by numbers) file

or

.SAVE file

.ver are previous versions of your save. Saves titled ".save" are the current version and should not be deleted. You can delete the old .ver files, if you are very sure you don't want backups of the save, but you really don't need to. The game only keeps the previous 5 save points (.ver0 to .ver4) and will overwrite the oldest ones in order, so you'll never have more than 6 save points of any one save file, unless you start doing save as, but that creates a whole new save file/number.