There are a few things to consider here.
1. Keep it simple - the more complicated, the less likely it to be reliable (or for you to bothered to fix it).
2. Automate if you can. Remove yourself as a dependency if you can.
3. Keep a local copy for fast recovery and remote copy for increased data availability/DR (house fire, burglary).
4. Just keeping a replica of data does not mean you are protected. If your master data corrupts or gets infected with a virus (remember Cryptolocker?) then you are possible going to overwrite good data with bad on your next copy. Point in time restore is key.
Here is mine.
My master data is copied to two local drives. Automated.
Every night between 01:00-08:00 all new data uploaded to Crashplan servers (cloud storage)
Result = 4 copies in total.
The key advantage is obviously a copy "in the cloud" but as important is that Crashplan offers point in time restores so if something goes wrong, I can recover from before it happened. All for £4 a month for unlimited storage. Other cloud storage providers are available
Many other options out there, none will ever be zero risk.
Hope this helps.