I have gotten into the habit of using rsync to do my own backups of an encrypted volume containing my personal info onto an external hard drive. I did not use Time Machine, because I do not own the whole hard drive, I just have a volume of 100 GB on the host hard drive. I created the volume using Disk Utility. When rsync copies that volume, it copies a succession of 8.4 MB opaque "bands" to the HDD (these "bands" are how a Volume is actually stored on disk - you can see by right-clicking to see the contents of the package on a .dmg).

My question is: can I restore that to a properly readable volume, should I need to recover data from my backup? I never had to try for real, and I hope to never have to, but I am wondering if this is actually a viable backup strategy, or if I wouldn't be able to restore a readable volume from those "bands".

Here is the rsync command I use:

rsync -arv --progress "/Users/frank/MyFile" /Volumes/Backup
  • Which command/arguments are you using to do the backup? Are you actually using rsync to backup the encrypted dmg or what is the meaning of "band"? Have you ever tried to access your backuped data (or to restore it)? – nohillside Jan 3 '16 at 18:10
  • @patrix: I added the comment to my original post. I haven't tried to restore the data yet. I am not sure if the "bands" are an artifact of rsync, of of the Apple Volume. – Frank Jan 3 '16 at 18:30
  • Actually - I just checked - the bands are inside the .dmg seen as a package. If you right click on a .dmg and ask to see the packages contents, you will see it is made up of "bands". – Frank Jan 3 '16 at 18:32
  • Well, trying to restore it (to a different location) might be the better proof (or lack thereof) than any answer here could be :-) – nohillside Jan 3 '16 at 19:39
  • True enough - I can try and report. – Frank Jan 3 '16 at 21:23

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