how can i create a script to backup sub-directories using Tar & Gzip, define threshold, and SSH file to
remote host

yes you can go through rsync but as you are interested in ssh...

its easy to prepare a script for tarring then zipping and then do scp...

What is the threshold you are talking about ? is it the size if it is so

use

size = du -s <directory name> | awk '{print $1}' ---> To store the file size in variable size.

Then check if the variable size is more than your threshold. If it is you can proceed with tar then zip then scp and then recreate the directory.

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