I have more and more big files to transfer between my end user devices (laptop, mobiles, ...). The goal of this blog is to compare cpdup and rsync to synch files between my OpenBSD laptop and my NAS. Today, files I'm managing are bigger and bigger. For example, with modern camera I often have +500 photos to transfer which represent +6GB of data. Moreover, I'm an heavy user of hardlinks, so I want to make sure all my hardlinks are correctly reproduced on the NAS.

With the posix [tar](http://man.openbsd.org/tar) command, we cannot exclude files' pattern like [gnu-tar](https://www.gnu.org/software/tar/manual/tar.html) does. This article will propose some alternatives.

In this blog some news concerning the last changes implemented in yabitrot version 0.4

It was a good experience to present my NAS server to the fosdem. In this post I share some extra elements

In order to be sure that the backups of my NAS were coherent and consistent, I was looking for a bit rotation scanner. Unfortunately, I did not find what I need, so I've written mine. This blog explain the why, the how, ...

You are an happy owner of a NAS running on OpenBSD proposing NFS shared drives. And your life is perfect with [OpenBSD client](/post/post_20160822) (maybe you have read one of my article on that subject). But this idilyc echosystem is in danger when a friend of you comes and connects is brand new Linux laptop on your NFS server.

Let me share my expertise for the best parameters of NFS client on a laptop running OpenBSD.

In this post I'll explain what I did in order to have the concept of [Time machine](https://en.wikipedia.org/wiki/Time_Machine_(OS_X)) on my NFS server. As you can imagine this solution relies mainly on the HardLink concept and use `rsync` to perform the tasks. All of this is embedded in a small shell script. It works well on my OpenBSD machine, but should also works on any Unix-like machines.

I'll explain how I've configured OpenBSD in order to have an encrypted Network Area Storage

When you have machines that must run 24x7, you must take into account the problem of powercut. To my eyes there is 2 possible solutions: - use an UPS - have a readonly operating system In this post, I'll describe how you can easily transform your OpenBSD machine into a Read-only system.