TAR tutorial: backup and tar specific files only - recursively

Use the following command

tar -cvf /backup/location/yourfile.tar -C . --recursive `find \( -name "*.htm" -o -name "*.php" -o -name "*.html" -o -name "*.php3" \)`

in the above command:

" \(" the beginning of a complex logical expression
"\)" the end of the expression
"-o" means that it's a complex logic - there's more than one -name in the linux find function.

This useful to backup only specific files on your machine.