On 10/27/2016 10:16 AM, Bowie Bailey wrote:
> The BackupPC project has a single developer who tends to be rather busy
> most of the time, so development happens in bursts with months or years
> between releases.
That's a lot of work for one person! I for one am grateful for the 
software, though I don't think there's any way I can meaningfully 
contribute to help (I'm not a programmer).
> I have not used version 4 myself, but as I understand it, the main
> difference is the use of hard links in the pool.  Version 3 uses hard
> links in the backup pool.  Every file has a minimum of 2 hard links and
> frequently more.  This makes it very difficult to copy or move the pool
> using rsync or other normal methods.  The only good way to move a large
> BPC v3 pool directory is to do a block copy of the filesystem.
I can attest to this. I've been trying to move my pool to a new machine 
for, quite literally, six weeks. Nothing seems to work reliably, and any 
attempt other than a dd|nc takes an estimated 80 days to complete - and 
I don't think my pool is really that big, about 15 machines on 1.2TB 
(All CentOS 6 or 7).

> Version 3 still works quite well and is what I use here, but I know
> there are some people on the list who have been using it version 4 for
> some time now.
Version 3 works *quite* well. I'm curious about v4 though, is it stable 
enough for production use?

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