Create tar.gz archives inside _backup directory for all directories in path

tarfolders.sh

# create folder _backup inside search path if it does not exist
mkdir -p _backup
# this finds all directories inside . excluding _backup and executes tar cvzf command. 
# it creates a tar archive inside _backup folder with the name <foldername>.tar.gz 
find . -mindepth 1 -maxdepth 1 -type d -not -path "./_backup" -exec tar cvzf _backup/{}.tar.gz {} \;