(Sorry for the English reply!)
Arq can back up anything it has permission to read. It runs as the logged-in user. It can back up /Applications.
This blog post has more detail about how I use Arq to back up my computer: http://www.haystacksoftware.com/blog/2010/07/how-to-back-up-your-mac-using-arq/
– Stefan (author of Arq)
