Use this unity script to save and load data. It will work with any serializable type.

DataManager.cs

using System;
using System.Collections.Generic;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public static class DataManager
{
	private static Dictionary<string, object> data;

	/// <summary>
	/// Necessary to call at the start of the program!
	/// _None_ will load no data
	/// False is returned on fail
	/// </summary>
	public static bool Init(string loadDirectory = "_None_")
	{
		data = new Dictionary<string, object>();

		//Check if im using directory
		if (loadDirectory == "_None_")
			return true;

		//Fail if loadDirectory does not exists
		if (!File.Exists(loadDirectory))
			return false;

		//Load to data
		BinaryFormatter bf = new BinaryFormatter();
		FileStream fs = File.Open(loadDirectory, FileMode.Open);
		data = (Dictionary<string, object>)bf.Deserialize(fs);
		fs.Close();

		//Return success
		return true;
	}

	/// <summary>
	/// Destroys the file in given directory
	/// </summary>
	/// <param name="directory"></param>
	public static void DestorySave(string directory)
	{
		File.Delete(directory);
	}

	/// <summary>
	/// Gets value of type T from key
	/// </summary>
	public static T Get<T>(string key)
	{
		if (data.ContainsKey(key))
			return (T)Convert.ChangeType(data[key], typeof(T));
		else
			return default(T);
	}

	/// <summary>
	/// Gets value of type T from key
	/// </summary>
	public static void Get<T>(string key, ref T val)
	{
		if (data.ContainsKey(key))
			val = (T)Convert.ChangeType(data[key], typeof(T));
		else
			val = default(T);
	}

	/// <summary>
	/// Check if a key exists
	/// </summary>
	public static bool Check(string key)
	{
		return data.ContainsKey(key);
	}

	/// <summary>
	/// Adds a value of type T
	/// </summary>
	public static void Set<T>(string key, T value)
	{
		if (data.ContainsKey(key))
			data[key] = value;
		else
			data.Add(key, value);
	}

	/// <summary>
	/// Don't forget to save!
	/// </summary>
	public static void Save(string saveDirectory)
	{
		BinaryFormatter bf = new BinaryFormatter();
		FileStream fs = File.Create(saveDirectory);
		bf.Serialize(fs, data);
		fs.Close();
	}
}