Best software for backing up a 12TB NAS, backup deletes also

I have a 12TB NAS with ~2 million files on it that I need to backup to an identical device.  I previously asked for the best software to make a 1-time copy of the NAS, thinking after the initial copy I could use my normal backup tools.  Rich-copy ended up copying all the files over, which is great, but now I need an ongoing backup solution.  

Basically what I need to be able to do is:
a) Schedule backups throughout the day, which will sync changes made from the main device, to the backup.
b) When a file is deleted from the main NAS, I need that file to be moved to a folder on the backup NAS (in the past I used SecondCopy's "Backup Deletes" function).  Bascially I want deleted files to be removed from the main backup, but copied to another folder, so that I can recover it if the deletion was done by mistake.  

In the past I have used SecondCopy for this, but the 12TB NAS crashes it every time.  Anyone have any suggestions for something designed for larger jobs?

Thanks!
Andrew_BellaAsked:
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Justin YeungSenior Systems EngineerCommented:
CA arserve support multiplexing which be able to handle it with reasonable price.

symantec netbackup is extreme expensive which can handle 12 TB back as well.

symantec backup exc doesn't support multiplexing and it is not able to handle millions of files backup in a short period
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Andrew_BellaAuthor Commented:
It seems like none of those can keep a copy of files that were deleted.  Do you have any suggestions for backup software that can do that?
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Justin YeungSenior Systems EngineerCommented:
these 2 that i think it supports it, however I can't 100% sure that will support 12TB backup

http://www.goodsync.com/enterprise/core-features

http://www.jumpingbytes.com/en/puresync/index.html

12TB backup will definitely need multiplexing support to backup, otherwise it is not able to finish the backup quickly, or you can do snapshot backp, however it will be a little annoying by restoring a single file (like vmware)

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