October 8, 201015 yr Snow Leopard updates TimeMachine so that it only works reliably with HFS+ file systems. It is highly integrated with HFS+ journaling. Can this be emulated over AFP?
October 9, 201015 yr Author I giving NSF one more try. I've set NFS to synchronous. Backup to sparse images is reliable via asnyc NFS. Sparse bundles do not work reliably on asnyc NSF. I will see if bundles can work over synchronous NSF.
October 11, 201015 yr Author From the hdiutil man page: USING PERSISTENT SPARSE IMAGES As of OS X 10.5, a more reliable, efficient, and scalable sparse format, UDSB (SPARSEBUNDLE), is recom- mended for persistent sparse images as long as a backing bundle (directory) is acceptable. OS X 10.5 also introduced F_FULLFSYNC over AFP (on client and server), allowing proper journal flushes for HFS+J- bearing images. Critical data should never be stored in sparse disk images on file servers that don't support F_FULLFSYNC. Hopefully unRAID will support F_FULLFSYNC on AFP. This should enable time machine support.
October 19, 201015 yr Author I found this doc on the developer.apple.com website. TimeMachineNetworkInterfaceSpecification.pdf
December 31, 201015 yr You should check this one: http://lime-technology.com/forum/index.php?topic=5184.msg56380#msg56380
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