Matt writes:
> I am using the rsyncd transfer method and would like to have each new backup
> be base to the most recent incremental, thus completely avoiding full
> backup after the first initial backup.
>
> Is this now possible with version 3.0.0 beta? Maybe $Conf{IncrLevels}
> can be use to this end but I don't see how.
Unfortunately that won't work yet, even in 3.0.0. In theory you
could set $Conf{IncrLevels} to a long, incrementing, sequence,
and set $Conf{FullPeriod} to be large too.
However, for each new backup, the full and all the incrementals
have to be merged together to get the most recent backup filled.
That's used as a reference for the next incremental. The problem
is that takes more and more time for each backup (ie: after a week
every directory on the client requires 7 directory reads on the
server; after a month it is 30). Also, no backups can be expired.
What's required is one more feature: filling in incrementals as
older backups are expired. That way old backups can be deleted
but a "filled" backup is kept so that more recent backups can
be reconstructed.
Note that with rsync a full backup (after the first) doesn't involve
a lot more network traffic than an incremental. In 3.0.0 the most
recent (merged) backup is used as a reference (rather than the last
full in 2.x) so files changed after the last full but before the
most recent incremental won't be transferred again.
The other reason to do a full is that the actual file contents are
checked. Incrementals just check meta data.
Bottom line: you still should do periodic fulls.
Craig
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