I use both USB and DVD backups.
I Play Backups on USB with : USB Loader GX and cLoader (Loadstructor)
I Play Backups on DVD with : Backup Loader
I load games onto 32 GIG USB dongle with WBFS
I store backups on NTFS as ISO on 1TB. USB hard drive.
As stated above, I create backups on DVDs with...