Noob Backing Up a Potential Home Media Server

I currently have a beelink mini pc on which I set up Immich. It's running fine, but I still need to work out a back up solution. My end goal is to have a home media server where I store my music, movies, and family photos. I understand the 3-2-1 backup strategy; What I'm unsure of is what sort of backup media should I use to implement that strategy given my goals / setup. What I was doing before was using a usb and a custom script that mostly uses rsync to back up my immich database and pictures / video; however this eventually became way too slow. Moreover when I tried to reformat the usb from Exfat to Ext4 to try to speed things up my usb stopped being read by the beelink. This is my first selfhosting project so I want to keep things simple while at the same time giving myself flexibility to build on in the future. I would eventually like to be able to backup an entire media server with one script / process in a reasonable time frame. I was currently thinking about an external ssd for the second device and maybe a cloud hosting service like backblaze for the offsite backup--I don't think I have the time or bandwidth to handle a second server at another location right now, but does that defeat the purpose of getting off google photos? Any suggestions for hardware / services / software I should be aware of or try for this specific situation?