Does any one now how the client software detects which clusters changed technically? Because the backup is quite fast if only little data changed, there must be another means of detecting changed clusters instead of rereading the whole hard disk and recomputing
cluster hashes, like it is done by all other imaging backup solutions I know (e.g. TrueImage, DriveSnapshot, Ghost).
As far as I know there is no timestamps information for clusters provided by the Windows aPI, nor is there any API for querying cluster change information from the file system. If there is a volume snapshot , the information which clusters are in the snapshot
is available to windows, but I know of no API, which provides this information to an application.
Is WHS using a special volume filter or file system filter driver which intercepts volume writes and maintains a "changed cluster bitmap"?. Or is it using an undocumented API or am I missing something?
