Bakker is a Ruby library and commandline tool to help with simple task of renaming or copying files for quick backup purposes. For instance by creating a copy of a list of files while adding .bak to the copies filenames. Bakker gives you control over the extension to be added to or removed from the file and whether it should be moved or copied.
Gemfile gem 'bakker', '~> 1.1.0'
install gem install bakker