The first thing you need to consider is matching the size of the media to the amount of data you need to backup. As hard disks continue to increase greatly in size, it becomes more difficult to find backup solutions that can handle the entire contents of a PC using a reasonable amount of media. Therefore first calculate the size of the data you need to backup and allow for that size to grow with time. The more disks or tapes it takes to perform a backup, the more of a chore it becomes and the less likely it is that it will be done on a regular basis. Their only possible use for backup is for archiving small files and used as an emergency boot disk in the event of a hard disk problem.
Backups are large, sequential writes and are therefore well suited to the use of tape drives.
The advantages of tape are capacity, cost, reliability and simplicity. The performance is generally slow, especially if you are using it just to restore specific files from the tape. Removable Storage Drives. The reliability of these devices is quite good and their performance is quite good. These drives have generally much higher performance than the smaller drives, and are slightly more expensive.