Disturbing TM deletion behavior after multiple restores

I have found a seriously disturbing (to me, at least) behavior in Time Machine after doing two system restores. Here is the scenario:
November 19: Time Machine has been working fine for months, and I have full weekly backups to June when I first upgraded to Leopard. Call this System 0.
November 20: My hard drive fails.
Later in November: Disk replaced with temporary, smaller hard drive while waiting on warranty replacement of failed drive. Swapped it in and restore from TM, excluding enough files to fit on smaller disk. Everything seems fine; TM is backing up again and old System 0 backups are also still there. Call this state System 1.
Mid-December: Replacement hard drive arrives; I reinstall OS and restore again from TM, using most recent backup of System 1. Call this System 2. I don't immediately restore the files I had sacrificed for the small-disk restore.
Today: notice that new backups aren't being made because TM was off by default. Turn TM on.
An hour later: I notice that the external drive has been cranking awfully hard for a while. I check it out and realize that TM has been DELETING ALL the backups from System 0! I stopped TM while it was most of the way through removing the last System 0 backup. I have now lost all the files that I had "temporarily" sacrificed to fit on the smaller disk.
My first question is, why did this happen? The disk was nowhere near full.
Next question is, when I turn TM back on, will it start deleting the System 1 backups when it finishes removing the System 0 backups?

eric zimmerman wrote:
I have found a seriously disturbing (to me, at least) behavior in Time Machine after doing two system restores. Here is the scenario:
November 19: Time Machine has been working fine for months, and I have full weekly backups to June when I first upgraded to Leopard. Call this System 0.
November 20: My hard drive fails.
Later in November: Disk replaced with temporary, smaller hard drive while waiting on warranty replacement of failed drive. Swapped it in and restore from TM, excluding enough files to fit on smaller disk. Everything seems fine; TM is backing up again and old System 0 backups are also still there. Call this state System 1.
Mid-December: Replacement hard drive arrives; I reinstall OS and restore again from TM, using most recent backup of System 1. Call this System 2. I don't immediately restore the files I had sacrificed for the small-disk restore.
Today: notice that new backups aren't being made because TM was off by default. Turn TM on.
An hour later: I notice that the external drive has been cranking awfully hard for a while. I check it out and realize that TM has been DELETING ALL the backups from System 0! I stopped TM while it was most of the way through removing the last System 0 backup. I have now lost all the files that I had "temporarily" sacrificed to fit on the smaller disk.
My first question is, why did this happen? The disk was nowhere near full.
TM will do a full rather than an incremental backup after a full system restore. that usually requires a lot more space and it will start deleting (without warning) old backups to make room for the new ones. go to system preferences->TM->options and see how much data is included in the backup. is free space on the TM drive bigger than that?
Next question is, when I turn TM back on, will it start deleting the System 1 backups when it finishes removing the System 0 backups?
Message was edited by: V.K.

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Matthew Connolly3 wrote:
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