Unfortunately that is not possible because of the hosting costs for Gitorious.org. We're reaching out to archive.org to index everything but it is probably not easy to git clone from there. Feel free to create mirrors of things that are important.
Destroying what might be the only public repository of some projects, and breaking a ton of existing links, is not something that sounds good.
Edit: I updated the size, it was not 12TB but 4.5
GitLab bought Gitorious so they could shut it down, not so they could give it to someone else. That is the purpose of acquisitions within the same field.
That's a pretty disingenuous thing to say when it seems like the only reason an "upgrade path" is needed in the first place is because of the acquisition and shutdown.
Edit: Even with Gitorious being "no longer sustainable" in its current form, there are other methods that could have been used (price adjustments, fundraising, etc) rather than an outright and very short-term shutdown.
It would be awesome if an other individual or organization is willing to sponsor the hosting costs so we could keep it open longer, if so please email me at sytse@gitlab.com or comment here.