I've been running my Synology for about a year now, and I've learned a lot:
First, deactivate the Admin account. Open Control Panel -> User & Group. Then, create an Admin account with a new name, such as JackAdmin, and assign this user to the Administrators group. Now, select the 'admin' account and Deactivate it. You might want to assign an ultra-ultra-complex password to admin, then deactivate it. This is extremely important.
Second, add yourself as a User. Create a user account such as Jack. You will use Jack for backups and standard file access, and JackAdmin only to administer your Synology. Jack will belong to the group 'users' and not to "administrators'.
Third, there's a YouTube channel called SpaceRex which has tremendous, easy to understand Synology tutorials.
Synology presents administrators with a folder called 'homes' and another called 'home'. This is confusing terminology. The 'homes' is visible only to administrators, and contains all of the user directories, and the 'home' folder is a link to your personal home folder. If you login as a standard user and not as an Admin, you will see only your ‘home’ folder.
I used to keep my ports 5000 and 5001 open on my router for remote access, but I get constantly hit with login attempts; about one every three minutes. These are all attempts to login to the admin account, which is disabled. After three failed login attempts, an IP address is blocked. My Synology has now blocked many dozens of IP addresses from all around the world.
I've switched to the QuickConnect method, so that none of my router ports are open.
I've done a few other things suggested by SpaceRex: I bought an external backup drive, which backs up my Synology daily. I installed a UPS, which will trigger my Synology to gracefully shut itself down in case of an extended power outage. My Mac backs itself up to the Synology via Time Machine every day. However, my photos are separate. They are too large to be stored on my computer's 512 GB internal SSD, so I bought a 4 TB Thunderbolt SSD. This stores all of my photos in a directory structure identical to the structure used on my Synology. When I shoot, I copy the photoshoot to the external SSD, and do all of my edits. After the editing session, I copy the directory containing the RAW images and the edited JPEG exports to the Synology. That may not the the ideal way, but it's my way.
What I've come to understand is that the Synology has enormous speed limits, and once you understand them, you can make the most of the platform. Trying to browse RAW photos or edit RAW photos from a Synology is sheer foolishness. Perhaps with a faster model and 10 Gb/s Ethernet, it's practical, but with the 1 Gb/s Ethernet which I have, it is not practical. As a backup device, it is excellent. As a remote access device, it is excellent. For hosting large files which colleagues can access or download, it is... fair, because it is limited to the speed of my Internet upload. Google Drive is far faster. But I've had several cases where I needed to host tens of gigabytes of videos or binary images, and Synology was great for that. The read/write speed of my internal SSD measures 4.2/5.0 GB/s my external SSD is 2.7/2.5 GB/s, and the Synology is 80/80 MB/s.
My next phase will be to buy another, faster Synology. I'll use this at my home, and I'll relocate my existing Synology to a relative's home, out of state, and perform encrypted backup from my home to my old Synology.