Thank you for your answer.
I am aware that's not an optimal solution, K.
For what i can understand here:
https://backuppc.github.io/backuppc/BackupPC.html#What-type-of-storage-space-do-I-need

Starting with 4.0.0, BackupPC no longer uses hardlinks for storage of
deduplicated files. However, hardlinks are still used temporarily in a few
places for doing atomic renames, *with a fallback doing a file copy if the
hardlink fails*, and files are moved (renamed) across various paths that
turn into expensive file copies if they span multiple file systems.

So there is a "fallback" if the filesystem does not support hardlinks.
Or maybe I got that wrong (I am not an English mother tongue speaker)...



> ---------- Forwarded message ----------
> From: backu...@kosowsky.org
> To: "General list for user discussion, questions and support" <
> backuppc-users@lists.sourceforge.net>
> Cc:
> Bcc:
> Date: Fri, 2 Sep 2022 14:31:18 -0400
> Subject: Re: [BackupPC-users] errors on network-mounted pool filesystem
> Are you sure that BackupPC is compatible with sshfs?
> While v4 drastically reduces number of hard links by eliminating the
> hard-link pool scheme, it still uses hard links for *temporary* atomic
> renames.
> See: http://backuppc.sourceforge.net/BackupPC-4.2.1.html
>
> Sshfs may have other limitations as it is not a full-fledged
> filesystem...
>
>
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