What is the point of the entire toolset if it does not allow for rewriting files to a replacement drive upon failure?

[dog-boots]

Am I missing something here? I am trying to rewrite a new drive from the dump that I created of my /usr/ folder, and have been utterly unable to. I have two drives properly configured, have every flag and command that I need set properly, have my bin files sorted, and have even installed a second OS of debian so that I can use wfs-fuse to directly browse into my new USB. All of this having been done successfully, and it having taken (not kidding) 7 hours to get to this point as someone that knows very little about linux, I find that I am unable to modify any file on my new empty USB drive. I cannot write my backup folder to it, as it continually spits the error "Function not implemented" at me. The only way it seems I will be able to write the backup to the new drive from a PC is using FTPiiu, which will literally take (no exaggeration) days to complete.

What am I missing? Where is the functionality to make this program worth using? I have great backups, but nothing to do with them.