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Problem trying to reduce size of managed vault

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We have BAR 10 advanced (Update 5 - Build 10.0.13762) product configured with one central backup server running AMS, with dedicated disk storage holding the managed dedupe centralised vault. I initially had the backup policies (2 of) configured with a retention policy configured to "Keep archive size within:" set to '600GB', and "Apply retention rules:" set to 'Before Backup'. I have now amended this on both policies to 550GB, but after subsequent backup runs, I do not see the size of the vault reduced below 600GB.

I need to get the size taken on disk reduced to prevent disk space alerting.

Anyone have any ideas?

Thanks, Paul

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IIRC archive size in retention rules is calculated per archive per machine. So if you have 2 machines backing up to [machinename]_archive_name , you will have two archives each less than 600 GB , totally 1.2 Tb. At least it is so for vault without deduplication as well for unmanaged. I have no idea how occupuied space is calculated for deduplicated vault.