Download from CRAN-like repository:
repos <- c("https://mokymai.github.io/download/", getOption("repos"))
install.packages("backup.tools", repos = repos)
Download the development version from GitHub
(note: to download, on Windows RTools
must be installed):
if (!require(remotes)) install.packages("remotes")
remotes::install_github("GegznaV/backup.tools")