olemus
varukoopiate infokandja: kõvaketas, ird-andmekandja, paber vm

ülevaateid
https://techvera.com/backing-up-your-data-which-storage-medium-should-you-choose/
https://www.salvagedata.com/how-to-choose-the-right-backup-medium/
https://www.arcserve.com/insights/why-tape-backup-is-experiencing-a-renaissance-in-the-digital-era
https://blog.archiware.com/blog/de/cyber-attacks-backup-medium-maximum-security/