You need to ask this to GoDaddy and Weebly. But to try to help, the site /blog was wiped as you edited the domain records (no site exists at GoDaddy at /blog anymore).
Options:
Retrieve and rebuild the posts from the cache link you gave.
Export the Database from GoDaddy (ask them) and then ask Weebly about it.
That all said, read the fine print at Weebly....
