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Backup Issues w new drive
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<blockquote data-quote="Rod" data-source="post: 1751867" data-attributes="member: 204485"><p>Time Machine performs incremental backups of changes to your HD. So after a time any drive you attach will become full. I usually recommend an external drive twice the size of your devices' internal HD for TM. But that is dependent on how many changes you make to the system and how far back you want to go for Restore purposes. </p><p>My attitude is that if you lost or damaged a file you would know about it fairly soon. So chances are you would only need to go back a week or two to Restore it but like some people who never erase their old emails (just in case) some want backups that go back years. If this is the case you will need to buy a new external HD every year. </p><p>Time machine has the ability to erase the oldest backups to make room for new ones and that default behaviour is what I allow. </p><p>Given that TM is really only good for restoring data in the case of accidental erasure or damage or to a new device when you upgrade there are much better alternatives for long term archiving.</p><p>I think of TM as good short term insurance so every time I upgrade to a new macOS I erase my TM backup and start a new one. </p><p>For most users a bootable clone is a much better alternative and I personally would rather have a clone than a TM backup if I had to choose between the two but obviously both is better.</p><p>For portability and convenience I have one 1Tb USB EHD partitioned into two halves, one for TM and one for Carbon Copy Cloner and another 1Tb EHD just for CCC which I back up to once a week.</p></blockquote><p></p>
[QUOTE="Rod, post: 1751867, member: 204485"] Time Machine performs incremental backups of changes to your HD. So after a time any drive you attach will become full. I usually recommend an external drive twice the size of your devices' internal HD for TM. But that is dependent on how many changes you make to the system and how far back you want to go for Restore purposes. My attitude is that if you lost or damaged a file you would know about it fairly soon. So chances are you would only need to go back a week or two to Restore it but like some people who never erase their old emails (just in case) some want backups that go back years. If this is the case you will need to buy a new external HD every year. Time machine has the ability to erase the oldest backups to make room for new ones and that default behaviour is what I allow. Given that TM is really only good for restoring data in the case of accidental erasure or damage or to a new device when you upgrade there are much better alternatives for long term archiving. I think of TM as good short term insurance so every time I upgrade to a new macOS I erase my TM backup and start a new one. For most users a bootable clone is a much better alternative and I personally would rather have a clone than a TM backup if I had to choose between the two but obviously both is better. For portability and convenience I have one 1Tb USB EHD partitioned into two halves, one for TM and one for Carbon Copy Cloner and another 1Tb EHD just for CCC which I back up to once a week. [/QUOTE]
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