In this situation, NetBSD will be running as the target, via the iscsi-target(8) daemon. ISCSI talks about targets (which is what a provider of an iSCSI disk is) and initiators (which is what a client connecting to a given target is). These raw blocks are typically provided from a sparse file, in the NetBSD filesystem tree. However, the NetBSD iSCSI implementation is robust, and efficient, and will provide arbitrary client-side filesystems (such as HFS+, or Windows filesystems) because its presenting SCSI disk as raw blocks. defaults write TMShowUnsupportedNetworkVolumes 1 Its probable that making the correct Apple sparse filesystem as a single file image, and moving this to the network-backed filestore gets round most of the problems, if you set the correct magic flag in your OSX to permit non-standard filesystems to be used to 'home' the time machine. They each have advantages and disadvantages, noting the need for special file support and extended attributes. If you want to use these, there are documented ways to do this, such as the apple time machine freebsd in 14 steps page Rui Paulo wrote. These are all provided by userspace daemons. Normally, its UNIX filesystems are mounted on clients by protocols like NFS, or SMB, or AFP (Apple File Protocol) through either the built-in facilities of mount_nfs(8), mount_smbfs(8) or a package like netatalk. NetBSD does not support HFS+ format filesystems directly in a way which can be exposed to an OSX host over the network. However, it is technically possible to do Time Machine over a network, to a network-mounted filesystem. Most of them use directly attached media like a firewire or USB disk, or an Apple appliance like the Time Capsule. But, having said that, its enormously useful and very user friendly, and lots of OSX users are very happy with it. Nor is it an archive: if you want to preserve something, you need to manage that independently of a time machine setup. Unlike a dump, its not a complete independent collection of files: it prunes back in time against what it knows has changed, and so cannot be relied on in the same way as offline disk or tape backup written in a rigorous system. You can walk 'back in time' against the history of the filesystem and recover older versions of files, or files which have subsequently been deleted. Apple Time Machine is a backup mechanism which uses an Apple sparse filesystem model, with extended attributes to store the files and directories of your OSX system as an incremental state.
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