you must regularly automate system maintenance tasks, for a variety of different purposes. One such purpose is backing up critical files to allow for restoration in the event of corruption or file loss. Please use Linux Ubuntu distro. Please provide step-by-step and detailed solution

Task : Write a bash script, saved to the file path /usr/local/sbin/backup.sh, that does the following:

1. Create a compressed TAR archive of all files located under /opt/confidential, using the gz compression algorithm. The generated output file created by the script should be saved in the /srv/archive directory with a filename of the format savefile.tar.gz

2. Execute the script to ensure that it works and that the appropriate archive file is generated. Make sure that only a single valid archive is present in the

/srv/archive directory when you have finished working

3. Ensure that the script is executable