my experience if anyone is intererested:
I am now using two Toshiba 2TB Canvio USB3.0 Portable Hard Drives - they are USB3.0/2.0 compatible.
I attached them to two USB2.0 host ports, as I planned to power the C2 via USB OTG only.
The power was meant to come from the wall socket with two built-in USB chargers, both 5V/2A. That did not fly at first, as apparently, the HDDs were peaking over 900mA, and the C2 could not initialize them (though, the board was doing fine, measures on GPIO pins and directly the chargers checked out OK - I guess the OTG protects from over 500mA supply).
So, I had to solder in alternative power input via J8 pins, and it did a trick! Now, the board uses both power supplies, whilst the drives look happy, syncing RAID1.
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Quick perf test:
# hdparm -t /dev/sdb
Timing buffered disk reads: 110 MB in 3.00 seconds = 36.65 MB/sec
# hdparm -t /dev/sdbc
Timing buffered disk reads: 102 MB in 3.05 seconds = 33.45 MB/sec
The spindown sometimes bites a little bit, and I don't know how disable it, as yet.
Next steps will be to play with ZFS and build something like an encrypted NAS with some redundancy.
EDIT: Nah... it does not seem to be stable to run two HDD, specifically, doing read/writes to each others - tried various configurations of raid to see one drive out of two constantly gets disconnected, and the dev tree rebuilt - it may suggets power or kernel issues - so I gave up and now trying just a single hdd config