You should always have a paper map and a compass if you don't know the area confidently. Phones do break, and power banks often fail in bad weather.
Though from the sounds of it, you're not doing anything serious where you'll actually be far away from civilization and roads. In your case, since the consequences of failure aren't a big deal, you don't need backups.
My thinking exactly.
I'm never far away from "civilization" and most likely won't encounter any truly "desolate" places anyway, especially in the spring and summer.
If I'd go on a crossing through Sweden or Norway, you bet that I'd have the necessary redundancies on hand.
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