I purchased an external 4TB SSD and I make a point of backing my stuff up offline (downloading via Takeout) every few weeks just in case some catastrophic accident happens on Google's end that results in my data being permanently deleted.
I store the local drive in a "fireproof" safe (note: fireproof is a bit of a misnomer, since stuff can still burn in a fireproof safe, though it's a better bet than not having one in the case that your home/apartment catches fire).
I also back up to Amazon Glacier as a third offsite backup. One could also use S3 for this, though it might be a bit more expensive than Glacier.
I store the local drive in a "fireproof" safe (note: fireproof is a bit of a misnomer, since stuff can still burn in a fireproof safe, though it's a better bet than not having one in the case that your home/apartment catches fire).
I also back up to Amazon Glacier as a third offsite backup. One could also use S3 for this, though it might be a bit more expensive than Glacier.