SSD back up

I use a 3.5" desktop HDD for my Time Machine backups.

Back up your Mac with Time Machine - Apple Support

Plus Clone a couple of 2.5" SATA SSDs using CarbonCopyCloner.

https://bombich.com/

SuperDuper is another good option for Cloning software.

https://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html

My Time Machine backup stays connected and does hourly backups.

My Clone backup SSDs get connected daily and weekly for updates.

if you value your data, yes. although an HDD is adequate as a backup disk.

you're welcome.