HELP! Snapshot is not working anymore

I really need help.

First of all I've made a backup of a website. Then I selected the import feature of snapshot from the website that I wanted it backed up on.

However, its not working. Its giving me an error message regarding some kind of timestamp.

I really need help with this. Can someone tell me what I'm doing wrong? I got this working before and it worked flawlessly. Not anymore.