Ok. Now that Dropbox is shady as well as overpriced, are there any good alternatives?
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HN has mentioned this several times in the past. I'm now looking at the prior comments about this.
I really wanted to use it and hoped it'd come out reasonably compared to alternatives, but I actually found none except buying a hard disk + raspberry pi myself and hosting it at a friend's place. That was cheaper by about a factor 2, which (at 3TB data) was too much to ignore for my student budget. This was about two years ago though.
The application does not ask or require root access. And they support Linux and FreeBSD as well.
SyncThing should also be mentioned. However, if you want to share folders to other people as well, Resilio Sync seems to be the best option.