If you tend to use iCloud for your Time Machine backup then ignore this.
An external hard drive that has more space than your laptop’s current SSD for a Time Machine backup. You will need an Apple’s SSD adapter that matches the pin on your SSD drive and the pin on your Mac’s SSD slot. Most users usually upgrade their SSD to 1TB of storage but the same company’s 2TB SSD should work too. A compatible SSD: Any NVMe SSD should work well, but for 2012 and early-2013 MacBook Pro models, you’ll need an mSATA SSD such as the Crucial MX500 1 TB. You can also get a Tekton screwdrivers kit that includes both of them A Pentalobe T5 (1.2 mm) Screwdriver (5 point star) and a Torx T5 Screwdriver (6 point star). In this article, we will provide you a step-by-step guide on How To Upgrade Your MacBook Pro SSD ( late 2012-mid 2015). But now SSDs’ price has dropped down drastically, allowing users to upgrade their MacBook Pro’s SSD themselves at a much lower cost. In the past, this upgrade was quite expensive. Therefore, an upgrade in SSD is surely necessary. However, this amount of storage will be running out quickly if you have done a lot of heavy-demand works like photo editing or video. The SATA cable is the weak link, one of many reasons Apple went to the PCI-e and soldered-in storage.The MacBook Pro models from late-2013 to mid-2015 are often configured with 256GB or 512GB of solid-state drive (SSD) storage by default. They can be damaged quite easily if the unit is mishandled during assembly or re-assembly. This type of cable can experience cracks in traces due to aging, heat, vibration, impact and abrasion. Those SATA cables are actually not cables but flexible circuit boards, usually mylar, with printed circuit traces taking the place of wires. As it cools down, electrical contact may once again be restored. As a unit heats up, it expands, and as it expands, the crack widens, eventually forcing a complete electrical separation to exist on both sides of the crack, hence a failure. 
In the case of an intermittent generic failure, the electrical continuity of a cracked trace on both sides of the crack is very often a function of the temperature of the unit at the point where the crack exists. It is however no mystery why old cables fail when switching from HDD to SSD. Agreed, a new SATA cable is a nominal expense and highly recommended.
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