Spotted this on Twitter. Interesting reading. Very clever.

@streakmachine Along the lines of my 2008 15-in MacBook Pro. It maxes out at El Capitan as well. I acquired it for $500 from a pawn shop in 2013 & it was running Leopard on 2 GB of RAM.
First thing I did was add 4 GB RAM, then last year a 240 GB SSD. Totally transformed. And, being pre-Unibody, it has the “proper” keyboard.
@variablepulserate The Micro B is actually a combination of the standard micro USB & an additional, smaller connector to enable the USB 3·0 speeds. If necessary, a plain micro USB cable will fit the larger of the two holes in the micro B port, although connection speed will be that of USB 2·0.
Just ordered a 4-pack of USB-C to Micro B sync cables https://www.amazon.com.au/gp/product/B07BW62QD6/ref=ohauidetailpageo00s00?ie=UTF8&psc=1 for my Mac’s backup drives: I have three external drives with a Micro B (micro USB 3) interface used with the MacBook Pro & one for the iMac 4k.
I’ve been using the standard USB 3 cables with cheap USB-C to USB-A adaptors but they’re tiny & too easy to lose.
Since today’s force multiple rebuild of the MacBook Pro, I have made two separate Time Machine backups, plus two bootable clones, one with SuperDuper! app, the other with Carbon Copy Cloner.
@matigo There was still a SuperDuper! app backup available, not needed. It turns out the backup clone that I restored from using Carbon Copy Cloner had actually been cloned using SuperDuper! app.
I reckon shirt-pocket.com could do us all a big favout by dropping the exclamation point from the end of therir app’s name.
@variablepulserate Snapshots came along with High Sierra and are taken every hour by time Machine, they are generally no more than 2 GB maximum. Prior to APFS, only laptops saved local backups (as they were previously known) but all Macs using APFS create snapshots. Snapshots are also saved very quickly.
More info here: https://www.lifewire.com/roll-back-apfs-snapshots-4154969
The Mac had been super-sluggish, my G3 Pismo PowerBook from 2000 was faster! It wasn’t connecting to the internet, no matter which process I tried.
With Carbon Copy Cloner being so quick & successful, I resolved to make those backups more frequent.