You can reduce your archive server space by:
1. Destroying deleted files
2. Compressing old vaulted versions
3. Coldstorage old file versions
Destroy files
Go for properties on a folder and select deleted tab
Users delete files but they are still stored in the Archive server until a Administrator permanently destroys them, destroying wipes all file versions of a file.
Usually it’s safe to destroy last year or month. A deleted mistake usually is restored immediately and usually users cannot delete released files but I have seen cases where an upset fired employee before leaving deleted some Intellectual property from the company so filter with care, in case of doubt, ask. You cannot undo destroy.
If you have left unattended the destroy bin, it might be full of deleted files. If this is the case consider Destroying partially on main folders instead of going for the full vault. For the database size it might take a long time and hit the performance side to complete that task or, do it off- business hours if going for the full vault run.
Compression
Setting up compression in an archive server is described in the Administrator Guide page 62.
The file zip format is based on zlib, so the older versions will be compressed to .gz files using zlib library (http://www.zlib.net/).
Set it up for a time after the backup routine is finished.
On first time you set it will take long time and resources if you have a large data set on that archive server . Schedule it for non business hours worldwide like the weekend, If still compressing during business hours performance on that Archive server can be degraded.
To read more, download the entire document here.
Article by Pedro Branco, Systems Engineer at Intercad