Dear all,

I just noticed that one of two virtually identical BackupPC instances,
both backing up the same host (my email server), reports for a couple
weeks that some files vanished - and they are. So why does it insist on
trying to download it over and over again?


In the error log of server 1 (the problematic one), I get:

file has vanished:
"/users/akobel-a-kobel/.BackupPC/cur/1538092391.M656164P24400V000000000000FC01I0000000001A60348_0.lupus.uberspace.de,S=6345:2,STa"

And, indeed, this file's gone since fairly long (the timestamp from the
filename indicating that it used to be there in Sep. 2018, and I trust
Sourceforge to keep archives of the backuppc-users list...).

I couldn't find the file in any previous backup, so probably it's been
stored in some intermediate backup that has been deleted since. Still,
it throws an error in each and every backup run, full or incremental.

The log of server 2 stays silent about this file.


Furthermore, and perhaps even more surprising, server 1 reliably complains:

file has vanished: "/users/akobel-a-kobel/.BackupPC/dovecot.index.log.2"

But *this* file didn't vanish at all - it's reliably there, whenever I
check. It's properly backed up by server 2, but exists in *none* of the
backups of server 1. (And, yes, I can read and access it - only one user
account on this host, and that's the one who created this file.)


Both BackupPC servers are running version 4.3.1-1 from the Arch Linux
repo; that is, BackupPC 4.3.1, BackupPC-XS 0.58, and rsync-bpc 3.1.2.0.
Both servers access the host via rsync, same host account. Identical
host config file and, AFAICS, server config, apart from the TOPDIR and
hostname. Only difference, as far as I can see, is that server 1
(problematic) has an uncompressed pool, server 2 a compressed one.

Several other hosts are backed up by both servers without any hickups.
Fsck'ing both gave zero complaints.


Any ideas about what could be the culprit?


Thanks,
Alex


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