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Incremental Chain question

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For Incremental backup. One chain would be Full backup then 5-6 incr. backups correct? I have it set to daily back up and to delete backups older than 7 days, and not to delete first backup. Why is it not deleting the in between backups?

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The age of a backup version chain is only counted when the chain is complete, i.e. if you set to create a full backup and 6 incremental backups, then create a new full backup ....  then your first version chain (full plus 6 incrementals) will start aging after the next full backup has been created, so will not be deleted until 7 days later, and in the interim, you will have created a further 6 incrementals for the second version chain....  and onwards.

 

Ok. That makes sense then. TY