Can't access backups after reinstalling windows

hello, i’m using urbackup via docker within unraid. just reinstalled windows on one of the clients and, after downloading the client-specific installer from the server, i can’t access the backups. at first i got the error 'no rights to access any files" followd by an error about the server url. i went into the webui and clicked restore on one of the backed up folders. the restore worked partly but is now stuck at 0% and times out. now if i click access/restore backups i get an error within chrome that says err_empty_response. help?