Backing up Cubase Pro 10.5 projects on a SD card

My laptop is hooked to a USB hub and this one goes to one of my 3 USB ports which now are all occupied (as well as all the USB hub ports).
But on my laptop I have this SD card slot doing nothing and instead of buying another external SSD drive, I thought I could use this SD card slot to back up my Cubase projects. Somebody told me that this SD card technology is an old one and I wonder if its safe to use it for that purpose.
My laptop :
ProArt StudioBook Pro 17 W700|Laptops For Creators|ASUS Global