I posted this in the QNAP sub but figured I'd get some really valuable input from here as well.

I'm looking at getting a TS-h1290FX as the main workhorse of my network storage with the intent to be:

• primary hosting of cloud synced files via iCloud
• storage of RAW photo / video files for editing
• where all my home entertainment containers would live (all *arr apps, with the potential for multiple versions of sonarr / radarr to split out 1080p vs 4k file management)

I'm also looking to have an expansion unit with the TL-1600S expansion unit which will be used for:

• storage of all plex files

My storage pools would look like this:

• 12TB array in the TS-H1290 (12x1TB) in a RAID6 setup
• 4TB SSD array in the TL-1600s (4x1TB) in a RAID0 setup (since this will be used for iCloud and that's already backed up, so I don't need fault tolerance)
• 320TB SATA array in the TL-1600s (16x20TB) in a RAID10 setup (this is for Plex files so I need the fastest read/write redundancy possible). Comes out to 160TB usable.

My main questions are:

1. is this the right kind of setup?
2. Is there a container / docker for iCloud? (not a deal breaker if there isn't - I could just run a Windows VM)
3. Would I need a QXP-1600eS for the TS unit as well in order to connect the 1600S expansion drive to the TS-h1290?
4. I've used unraid for a while, but does QuTS have a similar amount of available apps that are regularly updated?
5. If I want to install unraid on the TS unit is that possible, and will it recognize the 1600s?
6. I know the EPYC 7xxx has a good passmark score, but is it enough for Plex 4K direct streams and possible transcodes?
7. My network is built on a Ubiquiti Dream Router - do the two play nicely together?
8. Is there an S3 app so I can make backups to S3 Glacier?

Thanks for any answers you'd be able to provide!!