I'd like to change the command I'm actualy using to put files in a tar archive in order to achieve this:
1) Remove directories tree from the archive (actually the .tar.gz file mantains the tree of the files. I want the files to be "parent").
2) Remove the files used to create the archive and leave only the new .tar.gz
BACKUP_DEST=/home/backup/db/`date +\%G-\%m-\%d`
tar -czvf ${BACKUP_DEST}/files.tar.gz ${BACKUP_DEST}