Two computers and my phone, as of right now.
I have a desktop PC that I built in 2013 and besides drive-space that I add/upgrade as SSDs become cheaper. It has the original 240GB SSD and 2TB HDD I built it with, and two months ago I added 2x500GB SSDs. It's an i5 4670K with 16GB of DDR3 RAM, and a GTX680 graphics card. It ran Win7 up until two months ago when I swapped it for Win10, and a week ago I installed Manjaro on one of the 500GB SSDs and dualboot it, because I like games too much to give up Windows. This is my main computer that I spend most of my free time on. Gaming, hacking, tinkering, etc.
I also took over an Asus laptop from my wife that I installed Linux on (Arch, will replace it with Manjaro once I'm done setting my desktop up). I was going to use it to scratch my Linux itch and have something mobile that I can use in the living room or on the porch, etc. It's a backup mostly, so I don't really use it that much.
And lastly my Galaxy S7. Web access (using it now to write this), communications, etc. when I need something quickly or if I'm away from my computers.
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