HT201250 How does backupd decide what counts as a weekly backup?

Time machine seems to have decided that all but the oldest of my daily backups over a month old are expired backups to be deleted.
I thought it would keep all weekly backups until the disk became full.
The backup disk is far from full, so how did it decide that none of the backups it deleted counted as a "weekly backup"?

About TM "Backup Drive is Full" Alert
TM only deletes older files if they have been deleted from the source and when TM needs space on the backup drive for a new incremental backup. Time Machine "thins" it's backups; hourly backups over 24 hours old, except the first of the day; those "daily" backups over 30 days old, except the first of the week. The weeklies are kept as long as there's room.
So, how long a backup file remains depends on how long it was on your Mac before being deleted, assuming you do at least one backup per day. If it was there for at least 24 hours, it will be kept for at least a month. If it was there for at least a week, it will be kept as long as there's room.
Note, that on a Time Capsule the sparsebundle grows in size as needed, but doesn't shrink. Thus, from the user's view of the TC it appears that no space has been freed, although there may be space in the sparsebundle.
Once TM has found it cannot free up enough space for a new backup it reports the disk is full. You can either erase the backup drive and start your backups anew or replace the drive with a larger drive.

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You don´t have to insert your e-mail adress in this field, if you don´t want to have the e-mail back to some other adress (that is the only purpose of this setting - just like in Outlook)
The views I present are my OWN and not of any organisation I may belong too.

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http://www.auralex.com/
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HT201250 How does backupd decide what counts as a weekly backup?

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