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When working with VTLs you can send your "cartridges" to a remote vault,
let say IBM Cloud Object Storage or AWS S3 buckets, and set a non-erase
policy. You can do the same locally with Spectrum Protect Plus and set
a retention policy.
The point is... some VTLs does not support Deduplication index backup,
and an index corruption/deletion could destroy your backups, so you need
to replicate the cartridges you want to protect to a second VTL, use a
physical tape and remove from library (most VTLs support tape-out), or
use a second backup mechanism.
ie: When working in the cloud (IBM PowerVS) we use different backup
mechanisms: VTL for daily and weekly backups, Snapshots for change
management, Exports to OVA once a month (option 21 alternative), and
backup to disk to Object Storage bucket in a different vendor once a week.
It depends on the risks you want prevent and your budget.
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