Tape backup is the most common and least reliable data backup method in use today. Backup Tapes and Tape Drives are expensive and infamous for unpredictable failure and have an average failure rate of 100% — they all fail, it’s just a matter of when..

Tape backup can only be run once per day and is usually not setup to backup your e-mail, address book, favorites or bookmarks.

Most businesses fail to verify that the data they think is being saved is actually being saved. Industry wide - 77% of backup tapes tested showed errors and/or failures.

Tape Backup requires someone to insert and change the tapes - and most times, manually start the backup routine. Many times this process is performed by a non I.T. employee which leaves room for human error and directly adds even more cost to a backup process that is already unreliable and expensive.

Time involved to perform backup or restore procedures using a Tape Backup system is expressed in hours...
For Online Backup systems it is expressed in minutes.

What's the bottom line?
Tape backup is the most antiquated, expensive, unpredictable, and unreliable way of backing up your company’s data.