Get the 3 year for the 30% off. Also, if you have an external/network drive you want to backup, buy the package one up from Basic (Personal Plus - I think)
This will keep you happy when ransomware or hard drive failure or accidental deletion or theft or fire/water damage or Spot marks his territory on your computer destroys your files.
I’ve been using CrashPlan for about 5 years now. I love it. It’s cheap, unlimited storage for up to 10 machines. You can even do all sorts of things right on your phone with the CrashPlan app.
Also, look at using an SVN type of program so that you have backups of the things you purposefully saved over, but later realized had been better the way they were 80 hours of work ago…
And install a personal cloud on your wifi network (Seagate makes a good one). It gives you OneDrive/Dropbox capability but contained in your network. You can set it up to access the files remotely as well. A dual drive version allows you to have it mirrored so it’s protected against disk failure.
Been using Drobo’s since their 4 drive units (still in use also).
The 5N is incredibly fast. The new 5N2 can bond its 2 Gig network interfaces to prevent bottlenecking the bandwidth.
Synology has good functionality and apps, but the expand ability that Dropbox provides allows you to start small (2 drives of any size and manufacturers) and move up to 5 Drives of 10 TB each without having to move the data, expand the storage and restore the data.