There are a number of options available when it comes to storage media for storing your backups. In some cases your choice of storage media will depend on the size and frequency of your backups.
External and internal hard drives can be used easily. These may consist of traditional hard drives or the newer SSD and NVMe drives.
Another option is Flash memory devices like USB thumb drives which can be referred to as UFD or USB Flash Drives. These have gotten progressively larger and some will be available in 1 terabyte sizes later this year.
Optical storage media like CDs, DVDs, or BDs can be a popular choice for housing your backups. These come in various sizes and rewriteable media types can be reused if you wish.
Many businesses use NAS or Network Attached Storage, but it’s also becoming an option in homes that have multiple computers. You can also use tape drives for your backup and there’s also cloud storage which has become very popular.
This gives you a wide range of backup storage options to choose from!