Why Time Machine will not erase old backups when it needs more space for a new backup?

I have problems with Time Machine.  I am running on an iMac (21.5 inch, end 2012) with a processor Intel Core i7 3.1 GHz and 16 GB 1600 MHz DDR3 memory.  My OS is El Capitan, 10.11.3 version (15 d 21).

Since a few days I received the following Time machine error message:

Time Machine could not complete the backup "IoSafe.

Backup disc neds 47,49 GB for backup, but only 39,98 GB are available.  Select a larger drive for backup or do

the smaller by excluding the backup files.

I thought that Time Machine was supposed to automatically delete older backups when there was not enough space on the backup drive.  Am I missing something?  Is that what I can do to diagnose the underlying problem?

-Is [Larry] is-

When you enter Time Machine, you see windows cascading over time. The foreground window represents the current state of the data and those behind it successive snapshots of data taken by Time Machine. Is there only a snapshot (i.e. one behind the windshield), or more than one?

Tags: Mac OS & System Software

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