We're planning an overhaul of the themes system which will include automatic backups of your previous settings. (Probably not in the very near future, as it's behind a lot of other higher priority work, but it's something we've been working on in the background for a while.)
Good to know, thanks.
I really like how the text is so clear with a dark theme. Great stuff.
Can you please make the dropdown (to open a folder, in the left panel) a lighter colour, as its very hard to see the icon.