No matter what backup hardware people use, they must check the backup files to make sure the backup hardware is working, said Dan Buda of the Central Iowa Computer Users Group. Otherwise, the user could be in for a nasty surprise. When his computer failed, he found out his backup was not working. It was just going through the motions. Disks are cheap and can hold 650 megabytes of data.
Disks are compatible with the CD-ROM drives.
Some blank CDs may be incompatible with some CD writers. Disks are expensive. Disks can hold 100 or 250 megabytes, depending on model. As easy to use as a floppy drive. Disks are more expensive than blank CDs.