rdiff-backup doc in infra docs

[Matthew Miller]

On Mon, Oct 21, 2013 at 11:23:19AM -0600, Kevin Fenzi wrote:
> Review/feedback welcome. Are there any unclear parts? Anything not
> mentioned that would be good to know about backups?

What about retention? How long are the backups kept?

On my own systems, I run rdiff-backup with `--exclude-if-present .NOBACKUP`.
This makes it skip any directories containing that file, and is useful for
subdirs with a lot of churn. For example, /etc/selinux/targeted -- but
perhaps most useful for people to put in home directories where they may be
dropping large temporary files that are actually okay to not be backed up.

Also, you probably already know this, but rdiff-backup does not have any
special handling for moved files -- they are treated as deleted and created
anew. This can mean that simply renaming something a lot can use up a lot of
space (unless of course the underlying filesystem is deduplicated, of
course).


-- 
Matthew Miller  ☁☁☁  Fedora Cloud Architect  ☁☁☁  <mattdm at fedoraproject.org>