Hi,
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What actually gets written to tape by long-term protection?
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It really depends if you are using short-term to disk or not.
1) You are using short-term to disk, long term to tape (D2D2T)
In this configuration the last successful disk based recovery point is written to tape.
The data is read from DPM recovery point and copied to tape.
2) You are using short-term to tape and long term to tape (D2T2T)
The first LT recovery goal is a full backup taken from the protected server.
Other LT goals are tape copies from lesser goals, so you need multiple tape drives.
As noted - all long term tape backups are full backups, no incremental backups are possible.
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