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Backup Help Time Machine WD Mybook
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<blockquote data-quote="MacInWin" data-source="post: 1631775"><p>Well said, Sly! Sofia, what TM does is to copy the structure of the drive every time, then into the new structure it puts only the changed files. Then the magic starts: When you ask TM to show you the backups, it magically shows all those unchanged files where they are in the overall structure and puts the newer files in at the appropriate dates. So to you it looks like a full backup on each date, but TM isn't actually copying everything every time.</p><p></p><p>I think in visual terms, so here is an analogy: Imagine a painting with dozens of panes of glass in front of it. I want to change something, but I want to keep the original painting as a backup, so I paint my change on the pane of glass closest to the original. Now when I look at the painting, I see my change. Then I decide I want to change something else, so I move out one pane of glass and make the change and now I can see the original, with both changes. I keep doing that until sometime down the road I decide I don't like one of my changes and want the original back. I move back through the panes to find the one with that change and remove it and now the original painting in that area is visible again. I've "restored" that part. Note that I didn't repaint the whole painting, just the changed bits. And I had to move back in time to where the change was done to restore to previous. Within limits, that's how TM works. You see the whole drive in each backup, but it's not really the whole drive IN the backup.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1631775"] Well said, Sly! Sofia, what TM does is to copy the structure of the drive every time, then into the new structure it puts only the changed files. Then the magic starts: When you ask TM to show you the backups, it magically shows all those unchanged files where they are in the overall structure and puts the newer files in at the appropriate dates. So to you it looks like a full backup on each date, but TM isn't actually copying everything every time. I think in visual terms, so here is an analogy: Imagine a painting with dozens of panes of glass in front of it. I want to change something, but I want to keep the original painting as a backup, so I paint my change on the pane of glass closest to the original. Now when I look at the painting, I see my change. Then I decide I want to change something else, so I move out one pane of glass and make the change and now I can see the original, with both changes. I keep doing that until sometime down the road I decide I don't like one of my changes and want the original back. I move back through the panes to find the one with that change and remove it and now the original painting in that area is visible again. I've "restored" that part. Note that I didn't repaint the whole painting, just the changed bits. And I had to move back in time to where the change was done to restore to previous. Within limits, that's how TM works. You see the whole drive in each backup, but it's not really the whole drive IN the backup. [/QUOTE]
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