[daneel_w]

This is one of OpenBSD's shortcomings. While I like the fundamental design of all the file systems living contained within a "normal" MBR/GPT partition, the lack of advanced tools (no logical volume management, can only grow file systems but not shrink them etc.) has vexed me a couple of times during my 22 years of using OpenBSD. Thankfully it doesn't take long to get a good view of the storage requirements. I recommend playing around with OpenBSD in a virtual machine, e.g. VirtualBox or so.

[anthk]

With current SSD's speed and price just use dump(8) and restore(8) to and from external devices.

[messe]

I'm an OpenBSD user, and while that's a solution, it's not a good one. The poster is right, lack of a modern filesystem is a major shortcoming of OpenBSD; but sadly nobody with the right skill set has decided to work on that.

If I remember rightly there was some interest in porting HAMMER2 (DragonflyBSD's filesystem) to OpenBSD, but it's a lot of work with very few people both interested and experienced enough to put in the work.

[daneel_w]

Sure, or just roll a tar-ball etc. It's how to do it. It's just a bit of a round-about way, is all.

[anthk]

Yes. But most OpenBSD system partitions (anything but /home) get a pretty small size compared to the full disk, do dump/restore will work pretty fast.