jader
Yes, you have misunderstood what Affa is doing.
Affa archives use a FIFO principle (first in first out)
All backups are really daily backups, initially named as Scheduled backups.
As they age (ie reach the retention period specified) they are renamed to daily, then the daily are renamed to weekly, then as the weekly age they are renamed monthly, then as the monthly age they are renamed yearly, when the yearly retention limit is reached the archive file is deleted.
During that whole cycle some backups are deleted after their respective retention periods have been reached, but all backup archives are constantly being renamed, so that (after the retention period) every 7th daily becomes a weekly, every 4th weekly becomes a monthly & every 12th monthly becomes a yearly etc. The in between backups are deleted.
The need to restore data to a specific day, will determine the initial decision of how many daily backups you keep. If you need to be able to restore to ANY day in the last 28 days, then set daily retention to 28 days, & so on for weekly (say 4), monthly (say 12), yearly (say 2).
After 28 days you can only restore to the nearest week, after 4 weeks you can only restore to the nearest month, & after 12 months you can only restore to the nearest year.
I would think either 14 or 28 daily, 4 or 8 weekly, 12 monthly & 2 yearly. That should cover a wide span of time to allow adequate recovery from backups if necessary.
It really depends on your business model re backup & restore requirements.
Although all Affa backups are full backups (via hard links), they can be considered effectively incremental from a size usage perspective, so keeping additional daily backups does not place big demands on disk storage space.