I have to ask whether 30x versions of the same document are your actual requirements... if so, buy TSM. However, if you have a more normal requirement to hold data against business retention requriements i.e. 30x days for user group 1, 60x days for group 2 with both user group 1 and 2 having archive copies sent to tape media in an encrypted format and held offiste for extended retntetion (say 1x year as an example) then it would be CommVault Galaxy every time.
Single instanced storage is indeed version 1.0 of this technology. However, I have checked out the output of the technology and run a few scenarios. It maintains the same data structure as before when writing to media and also the same index structure as before also. The only new pieces added are the MD5 hashing algorithm (tried and tested all over the place and not new) and single instance database (usual btrieve type thing... again not new). So, the integration is new but not the pieces.
From my testing, there is no real improvement to the actual size of an incremental backup. Incrementals are typically new files. However, the big difference is to the size of each full backup. Galaxy takes normal or synthetic full backups and maintains links to objects already held in the SIS DB. From testing on my small rig I was finding a 6x improvement in the number of full backups I can actually hold on my disk library before the dynamic disk aging process kicked in and started pruning data.
So, important points... synthetic Full can be configured with storage policies to protect clients against specific business data retention requirements to ensure you hold data only for as long as the business wants it with the clients only ever sending incremental changes over the wire. SIS on the storage policy then comes to play to make sure that the disk library then only holds new objects with references placed securely in the SIS DB for all existing objects with same hash.
Finally, other features like End USer Search (Utilising FAST content indexing), GridStor (failover paths and loadbalancing of Media Agents), encryption of the vaulted copy to tape (ASE, Blowfish, 3DES etc) and extensive reporting capabilities should also be seriously considered as they will reduce amount of time to find data, the media usage through efficient tape sharing, remove unplanned data protection outage and have a real effect to the man hours taken to manage the environment. These features with SIS and Synthetic Full are more than a match to the next best vendor within this space (Which according to Gartner is Netbackup and not TSM).