Perhaps it should be documented that "Full Keep Count" system needs
perfect backup day overlap or it's backups in the middle of a keep chain
gets erased.

Full Period 6.97
Full Keep Count 4, 0, 1, 0, 1, 1

4 pr. week      (7 days, 28 days in total)
0 pr. 2 weeks   (14 days)
1 pr. 4 weeks   (28 days)
0 pr. 8 weeks   (56 days)
1 pr. 16 weeks  (112 days)
1 pr. 32 weeks  (224 days)

32 weeks
30       full    yes     0       27/9 03:00      272.7           351.4          

16 weeks
254     full    yes     0       11/5 21:00      144.5   123.7   

4 weeks
338     full    yes     0       3/8 23:00       114.5   39.6    

1of4
352     full    yes     0       17/8 23:00      162.2   25.6    

2of4
359     full    yes     0       25/8 01:00      163.6   18.5    

3of4
366     full    yes     0       1/9 06:00       145.6   11.3    

367     incr    no      1       2/9 06:00       23.7    10.3    
368     incr    no      2       3/9 06:00       31.1    9.3     
369     incr    no      3       4/9 06:00       50.5    8.3     
370     incr    no      4       5/9 06:00       61.4    7.3     
371     incr    no      5       6/9 06:00       39.9    6.3     
372     incr    no      6       7/9 06:00       109.9   5.3     

4of4
373     full    yes     0       8/9 06:00       202.6   4.3     

374     incr    no      1       9/9 06:36       23.2    3.3     
375     incr    no      2       10/9 06:00      24.4    2.3     
376     incr    no      3       11/9 06:00      26.6    1.3     
377     incr    no      4       12/9 06:00      26.3    0.3     


The oldest backup is pretty far away from the half a year I expected.

So in a few days we make another full backup.

1of4 becomes 4 weeks

4 weeks is at 4x days not matching 112 days so is erased?

Not until 16 weeks reach 32 weeks and gets promoted to 32, do I get 4
weeks promoted to 16.

If I had gone with a system stopping at 16 weeks, I would only get the
very first backup ever made retained as 16 weeks.


I had to sit down with crayons and cardboard and draw myself a pretty
picture before I got clued in, Full Keep Count is complicated and if
it's mentioned it will erase backups in the middle of the Full Keep
Count chain, then I missed it.



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