> Backups on a filer simply use dump, so nothing magic there. Many
In Windows, the block level backup speed is NOT related to number of files on
The reason is that in Windows, such backup has no need to enumerate the files.
There is FSCTL_GET_VOLUME_BITMAP call which allows to enumerate the _busy
blocks on the volume_, regardless of to what file do they belong.
When I saw Linux last time (early 2000ies), it only had FIBMAP IOCTL which is
the same as Windows's FSCTL_GET_RETRIEVAL_POINTERS - get the disk block number
for a file offset. As about FSCTL_GET_VOLUME_BITMAP - it was absent in Linux.
Maxim Shatskih, Windows DDK MVP