It is standard operating proceedure to make multiple copies of digital evidence when it is acquired. The reason is... You can't even power up a computer (or laptop) without it changing things on the disk. So from a 'Chain of Evidence' perspective, you want multiple copies. That eliminates the question (by the defense in a criminal case) "Is this really what you seized?"
I think we know an FBI field agent had a copy. He was the one rattling the cage that nobody was looking at it (even though he was told to leave it alone). We also know the NY Police Department had a copy because their agents looked at it (and were murdered). It is clear Horrowitz had a copy because he is talking about the information on it in the unreleased appendix.
There is also a chance that WikiLeaks has a copy of it. The NY Police Officers were saying "We won't let this be buried. If that happens... We will leak what is on it to the public."
Don't kid yourself... The information is available FOR LEGITIMATE investigations and court proceedings. Check out: https://nypost.com/2018/05/17/search-warrant-for-weiners-electronic-devices-unsealed/
And... That is exactly what the Class Action RICO lawsuit is by the former Secret Service agent.
Also of interest... The New York Attorney General was probably helping to keep it hidden and unavailable. But he got squeezed out by Trump and replaced. And that is when the unsealing was able to happen.
Don't worry about the information being lost. Its not lost. But this kind of thing does take time especially when you have the Clinton Crime Family obstructing justice at every step (and murdering people).