IIRC the 2019 discussion was talking about it depending on retention used. I don’t recall design intent.
FWIW my Backup retention is a Custom backup retention, and the partial I made hasn’t purged:
which does match the pull request post:
For a “retention rule” (e.g.,
1W:1D,4W:1W,12M:1M), partials are not removed, and a full backup will not be discarded in favor of a partial one.
Could you tell us what you’ve got? There is also the statement that:
For “keep a specific number of backups”, a partial backup can be deleted if it is followed by a full backup.
I don’t know if we’ll hear from experts. I’m glad manual tidy worked…