I haven’t set anything up yet myself. But, a Synology NAS makes it trivial for you to set up an offsite backup fairly easily.
I’d personally be hoping for something cloud-based but secure and affordable. I may be asking for too much! I currently get 5TB with Google.
Yep, you’re unlikely to get a better deal than what Google provides if you’re looking for cloud based.
But — “the cloud” is a vague term.
Let’s say you have a PC with a hard drive attached to it. If the PC has an Internet connection, you are technically able to access the files on that hard drive from anywhere in the world (provided you configure certain software to allow you to do so). At this point, you’re looking at your own “cloud”.
If you switch that PC and hard drive out for a Synology NAS with 2 or 3 hard drives, then you have a dedicated personal cloud.
Also, while it’s great that Google provides several TB worth of storage, there’s no way for us to know when that will go away. I’d rather have my most precious documents under my control - either backed up and archived on tapes or optical drives, or even digitally on flash drives.