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Archiving full backups only

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We are using Acronis Backup & Recovery 11.5 to backup our fileserver. Our boss requested us to have second backup copy of the last full backup on a secondary backup server/storage on which acronis agents cannot write directly.
As first attempt, I wrote a vbs script to archive the last full backups only: the script runs on the secondary server and via windows share it can access all .tib files.
The problem is: how can my script detect that a .TIB is a full backup archive ? The naming scheme of Acronis does not help. I have some files ending in "*F.TIB" other in *Fn.TIB, but I can't really understand which one is the LAST FULL COMPLETE backup to archive.
Is there a way to programmatically know that a TIB is a full backup ?

Thank you
Giovanni

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Normally *F.tib are indeed full backups, however sometimes only a part of full backup. E.g. if network was disconnected when backup was in progress and then reconnected, first 'volume' of the backup is left as-is and the rest will be written to *F2.tib. Without it, the *F.tib can't be restored. You may try to use acrocmd export backup ( http://www.acronis.com/en-us/support/documentation/AcronisBackup_11.5/i… ) to do the trick, but you need to get GUID of source backup first , parsing output of acrocmd list backup. As you can choose any name for the exported backup, you can then grab all produced files by a wildcard.
Another way is to copy just *F.tib file and validate them on the new location - if validation is passed, they are ok.