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Question

I reselected my disk in time machine, and now it won't back

Dec 9, 2013 3:01AM PST

OS 10.6, TM going to external disk. I don't know why I did that, it was dumb, but how can I undo it and reset whatever marker to the last "real" backup?

Discussion is locked

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Clarification Request
Backup is done to multiple places and many ways.
Dec 9, 2013 4:15AM PST

Are you falling for the siren song of a single backup system? No matter how easy TM is, it has a flaw that if you have an issue like this, where is your backup to your backup?
Bob

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PS. This sounds like a snapshot which will be fast. Why?
Dec 9, 2013 6:21AM PST
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Reply to R. Proffitt
Dec 9, 2013 7:12AM PST

Thanks for your concern, but this is not my only backup, but it is one of them and I would like it to work properly. I read the link you sent but it seems to concern a different problem than I am having. That person wants a full backup; I do not. I simply want it to do an incremental (normal for TM) backup starting from the last backup (Nov. 27), not from the moment before I stupidly reselected the same disk (this morning). That seems to have reset a control somewhere, so now it thinks it is just backing up stuff modified since this morning!

Eleanor

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I think a full backup would do for this round.
Dec 9, 2013 11:35AM PST

Since it's only a backup, a fresh start sounds like the ticket.

Let's hope there's more from our Apple guru.
Bob

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Clarification Request
Reselecting the backup disk should not make any difference.
Dec 9, 2013 6:05AM PST

What error messages are you getting?

P

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Answer to backup problem:
Dec 9, 2013 6:11AM PST

No error. Just that, instead of 2 hours and many many files, it finds 10 files and is done in 3 minutes!

Eleanor

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So it's working as designed?
Dec 9, 2013 8:47PM PST

Given that it backs up every hour, how many files actually change in that period of time?

Seems that many, many files would be a stretch for 1 hour, unless, of course, you were very, very, busy.

P

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Reply to mrmacfixit
Dec 9, 2013 9:43PM PST

I don't do automatic backups, I trigger each backup manually, and the last (before my goof) was about 10 days ago. So, there should be lots of files to copy.

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(NT) OK
Dec 10, 2013 7:45AM PST
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Reply to "OK"
Dec 10, 2013 9:58AM PST

Okay what? I'm still stuck with a not-working-properly backup! Has no one every heard of this happening before? Does anyone know how to reverse a "re-select"? Oh, dear....!

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As Bob already said,
Dec 10, 2013 8:58PM PST

Start a new set of backups with Time Machine.

Time Machine does, sometimes, loose track of where it's at.

P