[Dump-users] Missing files on verify, hard link issue?

[Kenneth P. <sh...@se...>]

I'm using BackupPC to back my Windows servers up to a directory on my Linux 
server, then dumping to an external USB HD. BPC stores multiple copies of 
the same file (such as the same DLL used on more than one Windows client) 
once in a "pool" directory and hard links to these pooled files from 
per-client directories. It runs a periodic task that sweeps the pool and 
removes files with only one link (ie. not present on any client).

If I let the sweep task run during a dump/verify (restore -c) sequence, I 
get a lot of missing files, of course. So I stop the BPC service before the 
dump/verify and resume it afterwards.

On my first attempt I still ended up with a couple of missing files in the 
pool. I'm suspecting that the service shutdown may have left an earlier run 
of the sweeper still going, but before I investigate further, I wanted to 
check here to see if there might be other reasons the files might go 
missing. That there were only 2 files (not zero or a bunch) is suspicious.