cp: cannot create hard link Error - RSYNC, CIFS, Cloudron v. 9.0.18

[luckow]

Feb 21 14:05:20 "cp: cannot create hard link '/mnt/managedbackups/58732e6d-3bf2-4a05-bb5f-01696d7d848e/my.example.org/2026-02-21-124607-895/app_photos.example.org__v1.97.4/data/typesense/state/snapshot/snapshot_00000000000000009833/db_snapshot/016039.sst' to '/mnt/managedbackups/58732e6d-3bf2-4a05-bb5f-01696d7d848e/my.example.org/snapshot/app_ae48c3a4-2341-4a5b-80fe-852cd9f98cb6/data/typesense/state/snapshot/snapshot_"... 59556276 more characters,

And yes: the error is correct. There is an empty folder. There is no reason to create a link to nothing.

Q: How to clear the cache/memory of rsync to solve this problem?