On Sat, 2006-03-25 at 02:45, Tomasz Chmielewski wrote:
> >
> > You should be able to tell backuppc to make fulls as often as
> > you want. The only downside with rsync is the extra time
> > it takes to do the full block checksum compare on existing
> > files.
>
> Is it really the only downside of full backups?
>
> Doesn't a full backup mean that *everything* will be transferred again?
The tar/smb methods would transfer everything. Rsync will compare
everything with it's block checksum technique.
> In case of backup of several 50 GB servers over slow internet, that
> would be a never-ending daily disaster :)
>
>
> Does the full rsync backup in BackupPC transfer only changes (compared
> to the last full backup), or maybe it transfers everything?
> It's not clear from the documentation (which states: "A full backup is a
> complete backup of a share.").
Rsync will read everything at both ends during a full which
can be fairly slow, but only a small amount of bandwidth
is used for the comparison and otherwise only the changes
are sent. In the case of a slightly modified file like a
growing logfile, rsync will reconstruct it at the receiving
end from the part already their plus the differences sent.
This will result in a new copy in the pool. In the case
where an existing file is updated in the same way on several
targets, the new duplicates will be identified and linked
in the pool.
If you wanted to fiddle with the configs frequently you
could probably always run fulls, but change the command
for rsync fulls so on weekdays the timestamp/length
match is enough to skip a transfer but on weekends you
do the full compares.
--
Les Mikesell
[EMAIL PROTECTED]
-------------------------------------------------------
This SF.Net email is sponsored by xPML, a groundbreaking scripting language
that extends applications into web and mobile media. Attend the live webcast
and join the prime developer group breaking into this new coding territory!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642
_______________________________________________
BackupPC-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/backuppc-users
http://backuppc.sourceforge.net/
