Buying a Synology, newbie questions

[raymate]

HI,

Looking at the DS1522+ our network only has Macs and Raspberry Pi's. Have some questions if someone could advise.

1. If the enclosure dies, can I pull all the drives and push them into another identical DS1522+? In the same order will it boot up as before with all the data intact or does it not work like that? I was thinking of buying and identical DS1522+, if that does work would it also work if I only had 4 bays used in the DS1522+ could I move the drives to say a DS923+? Would that work?
   
2. Can I set up a shared folder that is size restricted and then send someone a URL to log into this folder to add or remove files? Is it then easy to just remove their access after they have finished and they can’t connect anymore? I have a few friends that may need to log in from time to time to send me files, but I don’t want to access Synology all the time. Guess it's a one-time connection to a specific folder only. In the same way can I have folders for family members that are not on my network (or country) and give them a URL for access or do they need to install some sort of Synology software for this, I would rather them have a URL so all they need is a browser.
   
3. If I have two identical Synology setups that are syncing to each other, then I move one to a different physical location, i.e., another house, can I log into the now-remote Synology to administer it, or would I need to be on the same network to administer it, i.e., I would need to drive to the other house to log into it for admin purposes? Assume both need to be logged into synology account for this to work anyway. Is this the quick connect feature, anyone link to a tutorial on doing this?
   
4. I'm a PLEX and iTunes user. Can it have my PLEX and iTunes libraries on the NAS and share them over the network? Is running Plex on the NAS a good idea, or should I continue to use my Mac mini as the PLEX server but reference the data on the Synology for PLEX to access? Can the NAS act like an iTunes server? My flex server is 95% for music I don't stream video from it and if I do its just DVD no 4K stuff. I have a full flex pass account.
   
5. On the supported drive list I see the Seagate Ironwolf drives that I would like to use, it lists the "ST12000VN0008 - 2YS101" obviously the "ST12000VN0008" is drive model what is the "2YS101" reference, any Seagate expert can advise. When I search for ST12000VN0008 its not  showing the 2YS101 in the search results. Im not seeing the Ironwolf Pro on the list which is a little annoying as I wold probably buy the Pro's 
   

Many thanks