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Apple Computing Products:
macOS - Operating System
Need guidance on adding Time Machine to my clone-based backup strategy.
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<blockquote data-quote="chemist" data-source="post: 1658345" data-attributes="member: 84235"><p>Good to know, thanks.</p><p></p><p></p><p>I'm afraid your approach won't work -- TM is not the same as CCC. If follow your procedure of alternating, I'll end up with two different TM backups that have snapshot gaps for alternating months. Consider the following: Suppose I have a file I create on May 10 then delete on May 15. That file will be accessible through the current TM backup, which runs continuously on my desktop. Now further suppose that, at the end of May, I do as you suggest, and swap with the alternate drive and perform a TM backup onto it. If I do this, the TM backup on the alternate won't have that file or, indeed, any file that was created and then deleted during that month! I.e., unlike with CCC, neither of the TM versions on the two drives will be compete -- <em>they'll each be missing all the intermediate backups that occurred during the time they were disconnected.</em> </p><p></p><p>The better way would be to have a primary TM drive running continuously, and then to drag its sparse bundle file to a portable I bring in from the bank once a month. That way I will have two complete TM backups, with no gaps.</p><p></p><p></p><p></p><p>I spoke to Apple Support, and they said that, with Yosemite, this is OK (for TM).</p><p></p><p></p><p></p><p>Sorry, this doesn't make sense to me. Note that I was specifically talking about having a small TM backup on my internal <em>in addition</em> to the two TM backups externally, vs. <em>only</em> having the two TM backups externally. Clearly, the former is not less secure than the latter! </p><p></p><p>Again, the reason for this would be to have access to some snapshots when I'm away from home and thus don't have my EHD's with me. </p><p></p><p></p><p>Sorry, this also doesn't make sense to me. It seems easier to manage two physical drives (with a TM and CCC partition on each) than to manage four physical drives. </p><p></p><p> </p><p>I'd highly recommend a full clone in a safety deposit box! If there's a fire or theft at your house and your equipment is all lost or destroyed, this would ensure you've got an entire bootable disk available to you.</p></blockquote><p></p>
[QUOTE="chemist, post: 1658345, member: 84235"] Good to know, thanks. I'm afraid your approach won't work -- TM is not the same as CCC. If follow your procedure of alternating, I'll end up with two different TM backups that have snapshot gaps for alternating months. Consider the following: Suppose I have a file I create on May 10 then delete on May 15. That file will be accessible through the current TM backup, which runs continuously on my desktop. Now further suppose that, at the end of May, I do as you suggest, and swap with the alternate drive and perform a TM backup onto it. If I do this, the TM backup on the alternate won't have that file or, indeed, any file that was created and then deleted during that month! I.e., unlike with CCC, neither of the TM versions on the two drives will be compete -- [I]they'll each be missing all the intermediate backups that occurred during the time they were disconnected.[/I] The better way would be to have a primary TM drive running continuously, and then to drag its sparse bundle file to a portable I bring in from the bank once a month. That way I will have two complete TM backups, with no gaps. I spoke to Apple Support, and they said that, with Yosemite, this is OK (for TM). Sorry, this doesn't make sense to me. Note that I was specifically talking about having a small TM backup on my internal [I]in addition[/I] to the two TM backups externally, vs. [I]only[/I] having the two TM backups externally. Clearly, the former is not less secure than the latter! Again, the reason for this would be to have access to some snapshots when I'm away from home and thus don't have my EHD's with me. Sorry, this also doesn't make sense to me. It seems easier to manage two physical drives (with a TM and CCC partition on each) than to manage four physical drives. I'd highly recommend a full clone in a safety deposit box! If there's a fire or theft at your house and your equipment is all lost or destroyed, this would ensure you've got an entire bootable disk available to you. [/QUOTE]
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Apple Computing Products:
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Need guidance on adding Time Machine to my clone-based backup strategy.
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