I thus deselected Verify Checksums, deleted the Drobo Share, created a new Drobo Share (Time Machine enabled), created a new sparse bundle as per your instructions and finally I invoked the Disk Utility Restore again, as per your instructions. I discovered (or so I thought) that Disk Utility preferences permits me to opt-out of Verifying using Checksums. Clearly Disk Utility needs to tidy up at the end of the process and I prevented it from doing that. This I had hoped would not affect the integrity of the copy but I was wrong. After a little thought and investigation and examination of the options I stopped the verification. That process seemed to be making no progress at all even after 12 hours. Disk Utility then went into verification mode. I followed your instructions and the process of copying was fairly rapid. A file is only safe if it is stored in 3 different physical locations, one of which is preferably off-site. Tip 2: Storing data on your Drobo, and then backing up to a Time Machine bundle on that same Drobo is not a backup. By doing this, you can instantly replace a faulty drive without running to the store. Tip 1: Keep your old USB Time Machine disk next to the Drobo, even if you have an empty slot. The first backup will take a bit more time, I think Apple built in a file check to see if the backup is still ok after moving it to another disk. Time Machine will automatically mount the Drobo Share if needed. Once the process is finished, do not forget to switch Time Machine back on in the System Preferences.My restore of 800GB over a 100Mb network took more than 2 days. If you have more than a 500GB backup drive, you wish you had invested in Gigabit Ethernet right now (yes that speeds it up tremendously). Make sure “Erase Target” is selected and press “Restore”.If you’re not able to drag the disks as described, you may want to unmount your old Time Machine drive, remount it, and restart Disk Utility. Drag the partitions, not the disks itself. Double check my screen shot, it’s important to get this right. Drag the partition on the mounted Drobo Time Machine disk to the “Destination” box. Click on “Restore” and drag the partition of the old USB Time Machine drive to the “Source” box.Open Disk Utility and select the USB Time Machine disk.Go to the Drobo Time Machine share you just created and mount the sparse bundle you see there.In System Preferences, switch Time Machine off.We only used Time Machine to create a sparse bundle with the correct settings. As soon as you see the backup starting (the “zebra” stripes turn into a normal progress bar), click on the cancel button. Time Machine will first try to create a sparse bundle and calculate what to back up. Wait for Time Machine to start, or force it by using the “Backup now” menu option.Select this share and fill in the Userid and Password you just created on the Drobo. In the popup, you’ll see your newly created Time Machine share on the Drobo.Don’t worry, we’re not damaging or loosing your existing backup by doing this. Open System Preferences on your Mac, and select “Time Machine”.Close Drobo Dashboard, we won’t be needing it anymore.Remove “Everyone” from the allowed users for this share (the “-” bottom right) and add the user you just created (the “+” on the bottom right).Be careful in choosing the size, you can’t change this later! Create a new Drobo share (the “+” on the bottom left), give it a meaningful name and select “Enable Time Machine on this drive”.It’s important to create a non-admin user to keep your data safe. Create a new user for your Time Machine backup.In the Drobo Dashboard, click on “Advanced Controls”, go to the “Tools” tab, click on “Settings…” and then select the “Shares” tab.Make sure that the free space reported by the Drobo Dashboard is at least as big as your old USB Time Machine drive.You should now have a working Drobo, with at least 2 drives in it, and it shares a “Public” share on the network. Connect the Drobo (in my case a Drobo FS) to the network and configure an Administrator password for it.So you want to use that new Drobo for Time Machine backups, but don’t want to loose history? Here’s how (baby steps, no tools required, screenshots included): Meanwhile, your Mac is happily making Time Machine backups to that trusty old local USB disk. If Santa treated you particularly well this season, or you have put some of your savings to good use, chances are that you have a brand-new Drobo looking at you right now.
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