Mount it, and then set that to be your Time Machine backup source.I’m running a Mac Book Pro with Mountain Lion (OSX 10.8.3).To do this, read this followup post, since it was a little more involved than I initially thought.I’ve been told that you can use EXT 2 formatted drives and they play really nice with the router, but you’re going to need something like Mac FUSE installed to properly handle the drive.By default, your Time Machine image will not have been mounted. Open up the drive that your Time Machine partition is on and double click on the .sparsebundle file that is there. I find this particularly helpful since sometimes I’m working upstairs or down in my office, and don’t want to drag the USB drive with me.After a minute you will see that your image has been mounted Finally, we need to select this image for our Time Machine backups. Open up a new terminal, and enter the following commands: Note: If you’re using OSX 10.6 (Snow Leopard) and below the process seems to be a lot trickier. Plus I can share the MP3 collection across my virtual machines and other Windows machines in the house.
After connecting, select the drive your Time Machine image is on (or both in my case since I’m sharing music on my Win Backup drive) and click connect. Now you can run your Time Machine backups and leave your drive on the network.Note: I just upgraded to OSX Mavericks (10.9) and the Ready Share drive is still readable and functional in Time Machine.You shouldn’t run into any trouble if you decide to upgrade.Close the Disk Utility program and open it back up again. In the window that opens up to specify where to save the image to, make sure you specify the proper partition again. In addition, we want our disk image to have the following settings: Once all the settings are in place, click the “Create” button and wait for the process to finish.Now you can eject your drive and plug it into the router to finish off the process. Launch the router admin tool ( select the “Advanced” tab, expand the “USB Storage” section, and click the “Advanced Settings” link.