On Tue, 15 Sep 2015 19:08:31 +0100
Wols Lists [off-list ref] wrote:

Throwing something completely different into the mix, how about
considering btrfs? It's not 100% solid yet, so you need to be careful
with it, but if you back up with rsync and the "in place" option, it'll
give you full backups for the cost of incremental.

However its RAID5/6 is not ready yet and even RAID1/10 lack some important
features compared to mdadm, not to mention performance optimizations.

On the other hand I have a great success running Btrfs without utilizing its
own RAID features, but as a regular filesystem on top of MD RAID5/6.

What you MUST do is KEEP AN EYE ON DISK SPACE! The main failure mode for
btrfs I'm aware of, is that a disk full can cause a fatal error. As in
"I've just trashed the disk - it's 'format c:' time". So if you hit 80%
or so, alarm bells should be ringing. Very loud.

And this is just an absolute deranged baseless FUD today, or maybe something
that might have been true about 5 years ago -- eons in Btrfs development.

-- 
With respect,
Roman