The Real Grunfink on Nostr: Files and folders should have ownership of the user running snac. Did you transfer ...

Files and folders should have ownership of the user running snac.

Did you transfer your data from the old VPS in a way that hard links were preserved? It's documented here in the Administrator Manual:

https://comam.es/snac-doc/snac.8.html#Special_cares_about_your_snac_you_must_know_beforehand

If you didn't, the purge process is most probably deleting old posts.