Having equal amounts of data to cartridge density eliminates the waste of storage and the excessive switching of tapes. In the case of modern data centers, high-capacity LTO media help minimize physical footprint and operator intervention. Three specific selection paths, depending on your infrastructure, are shown below:
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Current Standards (LTO-8/9): Select LTO Ultrium tape media with 12TB to 18TB native capacity, suitable to back up the entire virtual machine cluster or to back up uncompressed 8K video dailies.
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Legacy Archives (LTO-5/6): Have an inventory of older LTO data cartridges so that you will be able to restore historical financial ledgers or legal discovery documents that have to be provided during an audit.
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WORM Security: Implement enterprise cartridges with Write Once, Read Many technology, which makes it physically impossible to overwrite or delete firmware by ransomware malware.
Having considered your retention requirements, keep in mind that a combination of generations within the same library is a complex issue. Stick to one large-capacity LTO media standard of active backups, and only use legacy cartridges in read-only restoration operations. This combination method is a balance between speed and long-term adherence to the law.