Tape penetration in data centers remains very high, less than 15% of data centers have become tapeless. Disk is more forgiving of variable backup performance than tape is, plus it has the perceived advantage of better accessibility because of its file system like nature. With LTO-5 tape is now about $50 per TB. The most competitive disk systems, even with full deduplication and compression, are typically around $1 to $2 per GB or $1,000 per TB.”]
Source: https://www.darkreading.com/database-security/tape-and-disk-better-together