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Today, high-capacity SSDs are more affordable than ever. All for much less than the price of a new Mac. Replacing a Mac’s 500GB or 1TB hard drive with a same-sized SSD required at least $250 back then, but the benefits were tremendous: even an aging machine became markedly (5x) faster, silent, and - unexpectedly - more fun to use.

Otherwise, you're looking at a 7+ year old computer with unknown wear and tear that might work for a few more years or might need replacement of parts either this year or the next.When I first wrote about using solid state drives (SSDs) to radically improve the performance of older Macs, high-capacity SSDs were just beginning to become affordable. If the used 2013+new SSD drive+new battery is less than 50% cost of the new MB Air M1, then I would say go for it. Secondly, the battery on the 2013 is probably on its last legs if it's the stock original. With the new blade drive, everything in Mojave is now so much faster and the feedback is instant just like it was when it was on High Sierra or Sierra. So you may need to factor that cost if the old SSD in the used 2013 is dying of use and age. Replacing it with a newer NVMe blade drive 3x the capacity brought it back to life, not to mention it is 3x faster than original (400Mb/s vs 1200Mb/s with my new blade drive). My original 128Gb SSD in my 2014 died and before it died, it was slow as dog to load anything. Will the 2013 run well depends on the age and condition of its internal SSD drive, which is already about 7 years old. I had contemplated Big Sur, but with my new blade drive in my Air right now, I'm confident it will run well. I run my 2014 Air on Mojave and plan to keep it there for at least a few more years only if I can squeeze my Air out off a few more years at least into 2024 before I contemplate on the new MB Air.
