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10.5: Use multiple Time Machine disks for redundancy
Authored by: Ron Crocker on Jun 04, '09 08:22:04AM

I just happen to have a spare 750GB drive (formatted capacity 698.32GB) laying about with which I can give this a spin.

I understand that the "weekly" in the hint is a suggestion, but it seems like perhaps monthly would be a better approach. This matches better Time Machine's structure of "hourly for a day, daily for a month, weekly for ever."

Using a monthly swap gives 2 months of dailies. This could be extended further to N months using N disks, of course, but at some point it becomes ridiculous.

Any thoughts/comments on that approach?

Ron



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10.5: Use multiple Time Machine disks for redundancy
Authored by: SOX on Jun 04, '09 08:47:52AM

sounds like an improvement. The trade off is risk aversity to catastrophe and how valuable a months work is. I happen to live in a lighting heavy area so keeping one disk unplugged is appealing.

important tip: when you innaugurate the new disk, don't try to get clever and copy the old disk to speed thing up. let time machine do it itself. it's imprtant that time machine know you have two disks which is will mark with different disk ID numbers so it can tell. if you make carbon copies you will fool time machine and it will not make faithful syncs. that is, just let it do it it's way , don't try to out smart it.



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10.5: Use multiple Time Machine disks for redundancy (or in conjunction with Time Capsule)
Authored by: seahermit on Jun 04, '09 08:51:02AM

I do this actually - but for a slightly different reason... I have a Time Capsule at home, but when I'm away (for work or holiday) I use a little USB drive and point Time Machine to that - works really well.

One thing I have noticed, is that if it's been a few weeks between using the other disk (last time this was after 5 weeks) the backup took a while as it had to do a deep node traversal, which meant Time Machine had lost track (for that drive) of which files had changed. This has happened a few times now after swapping, so I'd probably suggest swapping around the week frequency as suggested.

Also, that means that if one of your disks does blow up, you'll only lose a week at most! :)



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10.5: Use multiple Time Machine disks for redundancy
Authored by: pecosbill on Jun 04, '09 10:29:05AM

Here's another compelling reason to do weekly swaps: if you do have your active backup drive fail, you lose only a week of data. Otherwise, you'd lose a full month!

---
Pecos Bill



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