How can I minimize the size of the installation of a R package

At my workplace we are installing a lot of libraries for different versions of R. Size required is quickly going up. What can I do to minimise each installation as much as possible? I know about --no-docs and I require --with-keep.source

EDIT: Here is a quick study on my setup

I copied my library in /tmp/library

library(fs)                                                                             
library(data.table)                                                                     
library(stringr)
lib_dir <- "/tmp/library"                                                               
pkgs <- dir_ls(lib_dir)
dirs <- dir_info(pkgs, recurse = TRUE)[,1:3]                                            
setDT(dirs)
dirs <- dirs[type != "directory"]

# ==> We can see files at the root of each library take 12M in aggreagte <==
dirs[depth == 4, .(size = sum(size))]
#    size
# 1:  12M

dirs[, depth := str_count(path, "/")]
dirs[, pkg := file.path(lib_dir, str_match(path, sprintf("%s/(.*?)/.*", lib_dir))[,2L])]
dirs[depth > 4L, pkg_dir := str_match(path, sprintf("%s/(.*?)/.*", pkg))[,2L]]

# ==> The worst offenders are indeed libs, and lib is also large <==
dirs[depth > 4, .(size = sum(size)), pkg_dir][order(-size)][1:10]
#     pkg_dir    size
#  1:    libs 610.77M
#  2: include 144.18M
#  3:     doc 140.93M
#  4:     lib 104.58M
#  5:       R  91.31M
#  6:    help  61.78M
#  7:    html  51.02M
#  8:    data   25.9M
#  9:    java  11.74M
# 10:     www   8.38M

I then ran strip --strip-debug on libs and lib to reach the following

dirs[depth > 4, .(size = sum(size)), pkg_dir][order(-size)][1:10]
#         pkg_dir    size
#  1:     include 144.18M
#  2:         doc 140.93M
#  3:        libs  95.24M
#  4:           R  91.31M
#  5:        help  61.78M
#  6:        html  51.02M
#  7:        data   25.9M
#  8:        java  11.74M
#  9:         www   8.38M
# 10: htmlwidgets   8.24M

From the above example I have the following questions: docs seem to hold vignettes that I can access doing browseVignettes() I do not need this but I still require help("stuff") to work.

• Can I achieve this maybe using --no-docs or --no-help (I tried but running R CMD INSTALL --no-docs --no-html xtable still generates pdfs and html files)?
• Is there something else I can save without losing basic functionality ?