

If more than that, you probably want to look at some pro level solutions. If you are closer to 2TB of internal and external combined, get a 4TB.

If you have a 128GB SSD and a 1TB external, get at least 1.5TB. To know how big of a backup drive to get, just make sure it is larger than the total of your internal SSD and external drive. A USB 3.0 drive with sufficient space should be more than adequate to do a Time Machine backup during the night (where performance isn't going to hamper anything). You are going to back up your stuff, right? If you are going to be toting around another drive, there is a greater possibility of data loss physical damage, stolen, or just leaving it on a table somewhere in a coffee shop. You will need at least 2 external drives. As for performance, you probably won't notice much of a performance hit depending on exactly what you are doing. However, if not having all your files readily available on your MBP and toting around an external drive is not a problem, then going with a smaller SSD and an external drive is definitely a good choice.Īs for what you want to do, there is no problem with keeping your files like photos, movies, music, etc. Upgrading the SSD in the MBP to a larger SSD, whether you get it at time of purchase or you get it later on, is going to be an expensive proposition and the only reason that you do this is because you want as many of your files with you at all times without having to connect a portable drive. This is why they are so expensive as you have noticed. The MacBook Pro (MBP) uses a proprietary interface for their SSD PCIe 2.0 x4.
