If I can at least help on stranger on the internet… well, then I have helped one stranger on the internet 😂

Let’s say you want to test a drive that is mounted on /tmp… you just cd into that directory and you can use my example.

You can use

$> df -h or $> mount

to check how your drive is mounted in the OS Most ”default ” installations will have 1-4 partitions and / being partition 3 or 4.

So if you look at the mount command and / is /dev/sdX3 (where X can be a-z depending on how many drives you have connected) and no other mounts are in the output then every directory under / is on that drive… so you can run my example from your home-directory if you fancy that.

The cool thing about rsync is that it goes ”BRRRRRRRRR!” like a warthog… the plane… and it can saturate the receiving drive or array depending on your network and client. And getting 180 with rsync… on a SATA drive, can’t really hope for more.

And you can run a quick n dirty test is using dd

$> dd if=/dev/zero of=1g-testfile bs=1g count=1

If you use scp (cp over ssh) you should see the transfer speed.

Ok, so this is a ”how many colors of the rainbow there are”

If you go balls to the wall, all out retardation: Nextcloud, the CalDAV is basically just a bonus, I’ve replaced google.com at home with Nextcloud

Some middle ground: SoGo, sogo.nu

If you just want to solve this specific problem: Radicale, https://radicale.org and Baikal, https://sabre.io/baikal/