So you are making backups? That's good news, but are your backups backed up? As a good rule of thumb I back everything up to a network drive, then that network drive backs up to another drive and is also shipped to Backblaze for an offsite copy. Backblaze doesn't support network drives so I have them hooked up to an older mac mini that I use as a server. Backblaze is only $5/month for unlimited data, so you really can't lose there.
I always mirror my backup internally for when that drive fails and evenutally it will. That way I have a copy to swap out while I get another drive. Backblaze is used for total data loss. If all drives fail or burn up, are stolen, what have you; I will still have my data.
Yes I could use a RAID to mirror