Thanks for the response, it is working when I do it manually (Download) and I get it whole – the structure is right.
The problem with “zip file corrupt”, I have got it solved also. Simply removed old tmp files in my /uploads.
I guess the problem is somewhere in my dropbox account. I will check that and let you know.
Edit: #1/2 – Created another separate DropBox account, linked it, the same error message, Connecting to Dropbox fail. We are talking about a back up of 10 mbs.