Yeah, mine stopped working also, but this time the communicator would allow connection to the server.
But the automated backups were not occurring.
I had to re-setup the folders associated with the computer "Customize Backup For This Computer" and then the automated backups worked again.
Apparently there is an option for an anniversary clean install. Then install the connector.
I think that would be the best option. But definitely a pain in the butt.
Let us know how it goes.
Depends on what your storage requirements are going to be.
I personally favor RAID-10 (mirrored stripe) arrays because of the lack of a need for parity, but it's not particularly storage efficient, and with your current setup, you'd have only 4TBs (3.63TiBs) of storage space available (half of an 8TB stripe due to mirroring), in which a minimum 160GBs of that 4TBs is used for the C: drive if you partition the volume during installation.
WIth 4 disks, you could do RAID-5, which would give you 6TBs (5.4TiBs) of storage space (because 2TBs is used for RAID stripe parity), but then there's the parity performance penalty and the higher risk of an unrecoverable read error (URE) killing your array and losing your data if you're not using enterprise drives.
...or you could try Storage Spaces, I guess.
RODCs only work with "active" services like DHCP when the RWDC (your DC) is still active. If the RODC can't get the information from the RWDC, then the DHCP service stops on the RODC.
The problem is, since the RODC is read-only, it can't write back the DHCP lease information to AD, especially if your only read-write domain controller is down.
DNS and Global Catalog (AD authentication) works as long as clients are only reading from it, but DNS changes won't update if a client's only DNS server is a RODC.
AD best-practices is to have a minimum of two RWDCs for any domain (which Microsoft itself doesn't follow with the Essentials product in the first place), so that you have another writable domain controller that can update information in the event the primary goes offline.