Hi, I couldn't find anything in the docs. Is steekup available for Mac?

Thanks Thomas 

Yes, it is! On http://www.steekR.com, if you click on Download, you will be presented with the version for the platform you're on, e.g. Mac OS or Windows. There's a link to switch to the other one, look for it

well that one is for back-up matters, isn't it? I was wondering about a Finder-integration comparable to the Explorer-integration (or WebDAV).

Thomas, not sure what you mean with "backup matters", but the steekR Drive software for Mac is a full-featured uploader, similar to the one on Windows. Regarding the Finder integration, it will come eventually, but it's not as easy as it sounds.