1-Bay Synology NAS?

[Enquiries]

I use Apple Devices - 2017 MacBook, iPhone 7, iPad, and Apple TV & Samsung TV. I also use iCloud to store my data and sync. across devices.
I want to buy a NAS to provide an additional backup for the data in iCloud, plus storage of photos currently only on a SSD (scanned from prints plus images from a digital camera) and approx 50 DVDs.
I'm not interested in streaming videos to any devices other than the Apple TV so maybe transcoding is not a problem for me.
I've been advised that Synology makes good products but I've had conflicting reports of whether Plex will run on a DS118; Synology says it won't but another company (a reseller) says it will.
I'm trying not to go to the expense of a 2-bay NAS (such as the DS218) as this almost triples the price when 2 by Ironwolf HDDs are factored in.
I understand that a 1-bay NAS doesn't have RAID1 redundancy but, as I still have iCloud and the SSD I don't think I need a 2-bay model.
If Plex won't run on a DS118, are the Synology Apps ( Video Station and Media Server) as good as Plex?

[ed]

When choosing NAS for backups there are few things to look out for. Any NAS will be able to run a file server and therefore automated can be done on a computer side. But some other NAS will automate backups on the server-side. If you want a snapshot technology you may want a NAS with Celeron based processor. This will protect your NAS against things like ransomware and accidental data deletion. You will also get file version control just like on Dropbox. So if you made some changes in the file by mistake, you can always roll back to a few previous versions. Some models also come with a USB quick copy button at the front. This is a configurable button and will automatically copy data from/to the attached USB drive. This is helpful if you do weekly backups on the external disk. You can also set up remote replication service with another NAS over the internet. Either it is your seconds NAS or friend's NAS, your data will be automatically stored remotely and be encrypted. This protects your data against disasters like flood/fire/thieves.DS118 will work with Plex, but you can also use DS Video which performs better in remote streaming.I hope this helps.