The samsung evo is the new ‘hotness’ for ssd. Should be fine for what you’re looking at. not sure a 256Gb drive would be large enough to use as a storage drive for projects though. After a while the renders stack up
I have an ssd for programs and as the current project folder, and a 2Tb drive for all projects. That’s very specific to a small operation though, you may have to experiment to find the best setup for you.
Backup I use a usb3 external drive for data (so if I’m away the drive gets hidden), and also occasionally backup essential files to an online account (www.box.com).
