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I don't quite follow you. I don't understand about the "guessing high" on a sparse image vs. "when actually "testing" for size". Let's say you are doing a complete backup of a drive. If you know the space used on the original drive, then don't you know pretty closely how much space the sparse image will take? SD! does not have to reject creating a backup. It could give a warning to the user that a backup might fail to happen if there is not enough space. I have had a failure to back up happen about 5 times using SD! (in part because I did not know about the need for extra space). I have several backup drives, each with varying amounts of other data backed up on them. This is why I like using disk images - they keep the backups neat and separate. They also leave me with varying amounts of free space. I am glad you will add a direct way to back up to a sparse image. Needing to have double the space to make a disk image backup is a big limit on my ability to back up to the drives I have. How close is the tolerance from the original to the DMG? The disk image backup I stopped two days ago had 7GB on the sparse image, and was at something around 5GB on the DMG image - at highest compression. I understand that it may be hard to estimate the exact size of the DMG. What is the range? Is it from 90% to 100% of the original, or 30% to 100%? It seems like SD!'s main focus is on recovering from corruption on the original drive, rather than mechanical failure. The only major problems I have had with a drive have been mechanical failures. A running backup to a sparse image strikes me as a far better backup than having fixed backup to a DMG image. Ditto vs. the "Safety Clone" backup. Would a Safety Clone have helped with the two catastrophic drive failures I have had? These are the only situations where I lost a significant amount of stuff (and really lost it - drive recovery specialists could not get anything off of the drive). Thanks. - Winston |
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