You could also modify the /etc/passwd files to manually configure the uid/gid 
to match the old system.... 

Too late now, but there is usually more than one way to solve a problem.

Regards
Adam

On 24 November 2025 9:06:26 am AEDT, Kenneth Porter <[email protected]> 
wrote:
>I'm migrating from CentOS (an RHEL clone) to Debian. I moved my external 
>BackupPC drive to it (mounted at /var/lib/BackupPC) and copied the 
>/etc/BackupPC directory over. (I actually keep that directory on the root of 
>the external drive and mount it when the rest of the drive is mounted, so the 
>config stays with the drive.)
>
>The first issue I ran into was needing to rename the BackupPC directories to 
>backuppc, all lowercase. A couple of symlinks took care of that.
>
>I then chowned all the directories to backuppc:www-data. Doing that for the 
>external drive took over a day. There's got to be a better way for Linux to 
>handle removable media with millions of files. I'd read that bindfs can change 
>the effective owner of a drive but it's a FUSE filesystem so there's a 
>performance cost.
>
>The trickiest bit was that BackupPC was ignoring my per-host configs in 
>/etc/BackupPC/pc. Digging into the code, I found that Text.pm had been patched 
>(by the Debian packager?) to not look there. It disables useFHS and then 
>removes the line to fall back to looking in the pc subdirectory. Why?
>
>Now I have my backups working again.
>
>
>
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