Subject: Tar command
In tar command one can exclude the so called not so required folder & sub-folders during backup by:
[root@lino ~] # tar -cvf backup.tar projects/ --exclude="<folder path to be excluded>"
For excluding multiple folders:
[root@lino ~] # tar -cvf backup.tar projects/ --exclude="<folder-1 path to be excluded>" --exclude="<folder-2 path to be excluded>"
-c creates a new archive file
-v verbosely lists files processed
-f use archive file or device F (default "-", meaning stdin/stdout)
--exclude will exclude the folders and files