![](https://lemmy.world/pictrs/image/37a3ddf9-be01-4f15-a9c0-79cee1774967.jpeg)
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3.5 inch disks only held about 2MB on a good day. Reliable or not, you won’t get much on that disk these days.
Unless you are going to make your own backups and take them somewhere else, I would use a cloud solution. Yes, you have to trust the company you choose not to fuck with your data, but they are fault-tolerant solutions that will likely last longer than some random removable solution.
You should try to visit 7-11 in most countries, they are all very different!