Considering a Synology DS918+ to store video files that will be edited. Probably need about 10TB total storage.
Will probably use RAID 5
Expect 4 to 5 files open for editing.
What is recommended RAM for this application?
Also, who do you like for cloud backup?
It these files will be stored on the NAS and moved to the editing PC every time you need to edit them – this NAS will do the job (1080p or 4K or higher). If you plan to edit directly from the NAS without moving project files to your computer then probably Full HD video editing will not be an issue. But you may experience difficulties editing 4K files directly from the NAS. You may need 10GbE connection for that task. The cheapest option would be TS-453B with a 10G card or Synology DS1817 half populated with drives. You will not need much RAM for editing from the NAS either- de default RAM size will be efficient enough.
As a cloud backup, I prefer Backblaze – it offers unlimited storage space in the cloud. Can not argue with that.
Find regulary updated NAS offers here
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For backing up your NAS do consider BlackBlaze. You can try it for 15 days free if you don't believe its good. But the main reason is unlimited backup size. Everyone else like Dropbox, Amazon, and others charge per gigabyte. But with this one there is no price difference either you backup 2 bay or 8 bay NAS. The other great feature is version control. So even if you get hit by ransomware type of virus or simply deleted or mistakenly changed few files. You can restore your data from historical backup versions and get all data back.
You can get it for free here and try:
Comparison with other service providers: https://www.backblaze.com/best-online-backup-service.html#af9rgr