Backup

cdburnerxp.se - portable / easy to use XP, Vista, VII - free (needs .Net Framework)

Cleaner

hippofiles.com - CCleaner for Windows

Bleachbits for Linux and Windows

USB Creator

Ubuntu USB Creator, Linux Live USB Creator (partimage, clonezilla, g4l-ghost4linux, partclone), Redo Backup Distro, Parted Magic

DVD Images - ISO/Joliet max 4GB! - UDF full DVD size >4GB! - splitting/compressed backups with 7z, Winrar

Rsync

rsync snapshots