I have all CAR files of all my CIDs locally on my computer. (downloaded with lassie fetch)

I think it would be easier and safer for you if I could provide/upload the ipfs content archive files (CAR archives) of all my CIDs to be imported into nft.storage. This way you don't have to retrieve the CIDs from the nodes that may be down or very slow. The car archives files contain the complete ILPD DAG structure. You will also send these files to Filecoin to get Filecoin deals.

After that you can delete this car files from your server.