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10.5: Set up Time Machine on a NAS in three easy steps
This is a great hint, but several points need to be made. 1.) You can skip all the bit about naming sparebundles. Just try creating one directly from Time Machine. Yes, it will fail, but it will be visible on your desktop for a couple of minutes, giving you plenty of time to make a note of the name it assigns to the sparsebundle. Let it disappear, then create one manually with the same name. 2.) You manually create a sparsebundle using Disk Utility. The Help file tells you how. As part of the creation process, you will be prompted to assign a size to the sparsebundle. It is vitally important that you select a size less than that of your NAS volume's physical capacity (and it is probably a good idea to leave an ample amount headroom so that Time Machine has space to do its thing). In the same way, if you are using your NAS as a central repository to back up multiple Macs, the total size of all the sparsebundles on your NAS should not exceed the capacity of your volume. 3.) I can't help wondering if these reports of Time Machine destroying data once it has to start removing files come from people who created sparsebundles larger than the capacities of their NAS volumes. Maybe so, maybe not. In any case, I'm not sweating this because my volume is big enough that it will be several years before I confront this problem, and I figure that by that time Time Machine will have undergone a lot of evolution, so that this problem will probably be ancient history. 4.) But just to be on the safe side, and because this hookup is not officially sanctioned by Apple, as an extra precaution I keep duplicates of my sparesebundles on a separate hard disk, I can bring them up as backups if I ever need to. Nevertheless, I've been using this setup for over a month and so far haven't had any trouble at all. |
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