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I upgraded from rev 14 to 15. I created new backups when I went to this revision. Previously I used two incremental backup files that required cleanup. The settings I used on the previous rev. was to create a full backup and then 6 incremental backups. I set the cleanup for files older than 7 days. That seemed to work. At times I had 14 files and then the next day the older 7 versions would be deleted.

When I went to rev 15 I thought these settings would work again. That does not seem to be happening. The other day I set the cleanup to only preserve 1 backup chain yet nothing has been removed.

I presume the problem is me. I don't want to fill up my external drive. In my estimation I think I can accomplish what I want with only a week's worth of backups. Anyway that is what I desire.

I need some help in setting this up properly. Further, is it OK to manually delete some of the older backups?

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The same setting that worked in 2014 will work in 2015 if you stop using the old task and start the task over completely new with the storage destination pointing to a new storage folder or sub-folder.

Understand how the rules work.
You have selected your backup chain to be one full plus 6 incrementals or 7 files.
Then you have stated you want that oldest chain to be 7 days old before any deletion is to occur.
If you are doing daily backups, then you will incur additional daily backups while waiting for the 7 days to elapse after backup #7 has occurred, Thus the first deletion of oldest chain will occur seconds after the 3rd full has been completed which is when backiup #7 becomes older than 7 days. Next deletion will repeat on the next succeeding full backup.

No, incremental pieces cannot be deleted except either all inc keeping the full, or deleting the entire chain. Each inc contains data that no other tib file contains.

Reading your description the backup under rev 14 behaved this way. At times it would appear that I had two chains. Then the next day the oldest would disappear.
My plan is to start both of my backup procedures as new ones. I have the room on the external drive for that. I just didn't want to get into some kind of perpetual backup.
If I truly wanted only about a weeks worth of data to be stored is it better to limit the chain to one and not do the cleanup after 7 days?

If you start a totally new scheme from 7 elapsed days to "store 1 recent version chain" then deletion of the chain will occur seconds after the 2nd full (b2 full) is created, and no more deletion until the next full occurs.

Frankly, I would keep more chains if you have the room as my experience has been that when you need to recover old files, these need to come from older backups.

You may also have an interest in my signature link #1 below, item AGH-1 inside than link. It was written before 2015 but it still applicable. Changing a task causes problems. When changes needed, best to start over with a completely new task.