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Is it true that Synology DSM 4.3's default rsync implementation is not able to handle "vast" amounts of data and could mess up versioning / deduplication? Could it be that any of the variables (see detailed info below) could make this so much more difficult?

Edit: I'm looking for nothing more then an answer if the above claims are non-sense or could be true.

Detailed info:

At work, we've got an Synology NAS running at the office. This NAS is used by a few designers where they directly work from. They have projects running which consist of high resolution stock photos, large PSD's, PDF's and what not. We have a folder which is approx. 430GB in size which only consists of the currently running projects. This folder is supposed to be backupped in a datacenter, weekly through our internet connection.

All of our IT is being handled by a third party, which claims that our backup is beginning to form a certain size ("100GB+") where the default implementation of the DSM (4.3) rsync is unable to handle the vast amount of data to the online backup (on one of their machines in their datacenter). They say the backup consists about 10TB of data because rsync has problems with "versioning / de-duplication" (retention: 30 days) and goes haywire.

Because of this, they suggest using a "professional online backup service", which cranks up our costs per GB to the online backup significantly.

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