It doesn't sound like they want to use filesystem-mgmt tools, they want to use per-file tools. Wouldn't pax (or cpio) be a better tool to do these things?

Scott Dickson wrote:
A customer asked today about the ability to snapshot and rollback individual files. They have an environment where users might generate lots of files, but want only a portion of them to be included in a snapshot. Moreover, typically when they recover a file, they only want one or two of them. The idea of copying them out of a fs snapshot wasn't terribly appealing to them since they tend to have pretty large files. It would be nice to just reattach that file.

Is this reasonable?

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Jeff VICTOR              Sun Microsystems            jeff.victor @ sun.com
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