Here's what we use for unattended installs of TeX Live 2011 on Windows. The included profile may not match your particular preferences, but it's the quickest thing I can find. You might also find the profile for your current installation in tlpkg/texlive.profile in the TeX Live installation folder.
Run the following command
install-tl.bat -repository http://mirror.host/path/to/texlive/tlnet -no-gui -profile path\to\texlive-2011.profile
with the following texlive.profile (or one of your own):
# texlive.profile written on Fri Jul 29 19:52:14 2011 UTC
# It will NOT be updated and reflects only the
# installation profile at installation time.
selected_scheme scheme-full
TEXDIR C:/texlive/2011
TEXMFCONFIG ~/.texlive2011/texmf-config
TEXMFHOME ~/texmf
TEXMFLOCAL C:/texlive/texmf-local
TEXMFSYSCONFIG C:/texlive/2011/texmf-config
TEXMFSYSVAR C:/texlive/2011/texmf-var
TEXMFVAR ~/.texlive2011/texmf-var
binary_win32 1
collection-basic 1
collection-bibtexextra 1
collection-binextra 1
collection-context 1
collection-documentation-arabic 1
collection-documentation-base 1
collection-documentation-bulgarian 1
collection-documentation-chinese 1
collection-documentation-czechslovak 1
collection-documentation-dutch 1
collection-documentation-english 1
collection-documentation-finnish 1
collection-documentation-french 1
collection-documentation-german 1
collection-documentation-italian 1
collection-documentation-japanese 1
collection-documentation-korean 1
collection-documentation-mongolian 1
collection-documentation-polish 1
collection-documentation-portuguese 1
collection-documentation-russian 1
collection-documentation-serbian 1
collection-documentation-slovenian 1
collection-documentation-spanish 1
collection-documentation-thai 1
collection-documentation-turkish 1
collection-documentation-ukrainian 1
collection-documentation-vietnamese 1
collection-fontsextra 1
collection-fontsrecommended 1
collection-fontutils 1
collection-formatsextra 1
collection-games 1
collection-genericextra 1
collection-genericrecommended 1
collection-htmlxml 1
collection-humanities 1
collection-langafrican 1
collection-langarabic 1
collection-langarmenian 1
collection-langcjk 1
collection-langcroatian 1
collection-langcyrillic 1
collection-langczechslovak 1
collection-langdanish 1
collection-langdutch 1
collection-langenglish 1
collection-langfinnish 1
collection-langfrench 1
collection-langgerman 1
collection-langgreek 1
collection-langhebrew 1
collection-langhungarian 1
collection-langindic 1
collection-langitalian 1
collection-langlatin 1
collection-langlatvian 1
collection-langlithuanian 1
collection-langmongolian 1
collection-langnorwegian 1
collection-langother 1
collection-langpolish 1
collection-langportuguese 1
collection-langspanish 1
collection-langswedish 1
collection-langtibetan 1
collection-langturkmen 1
collection-langvietnamese 1
collection-latex 1
collection-latexextra 1
collection-latexrecommended 1
collection-luatex 1
collection-mathextra 1
collection-metapost 1
collection-music 1
collection-omega 1
collection-pictures 1
collection-plainextra 1
collection-pstricks 1
collection-publishers 1
collection-science 1
collection-texinfo 1
collection-texworks 1
collection-wintools 1
collection-xetex 1
in_place 0
option_autobackup 1
option_backupdir tlpkg/backups
option_desktop_integration 1
option_doc 1
option_file_assocs 1
option_fmt 1
option_letter 0
option_path 1
option_post_code 1
option_src 1
option_sys_bin /usr/local/bin
option_sys_info /usr/local/info
option_sys_man /usr/local/man
option_w32_multi_user 1
option_write18_restricted 1
portable 0
This doesn't really say how to copy the installation, but if you can find your profile, it does ensure you set things up the same way. And for us, TeX Live 2011 only takes around 20 minutes to install over the network.