Backup to storage is forever incremental with synthetic full backup to tape.
Backup-to-tape with synthesized full backup requires at least double of .vbk size.
Please read the linked topic and ask additional questions if you have any.
Could you please clarify the tape job schedule and synthesized full backup creation schedule (second step) you set for the said tape job? Thanks.
Tapes do not have a retention.
In the end there are two full synthetic backups with one being recent while the other one could be from last month.
Do you mean never overwrite data option is enabled?
Usually, it happens when the .vbk was copied to tape, then, after some time got removed from it, thus, backup server decided to copy the old file anew. See this thread for additional information.
If you're only copying full backup files, you'll be glad to hear that in version 9 we will add the ability to always copy only the latest full backup.
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