Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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USB isn't good for RAID, it's unstable.
Do you currently have more than 8 or 12TB of data? Because you can buy drives that size today, no need for RAID under those capacities.
I recently purchased an 8TB drive for ~$100 on Amazon. Yes, it's used, but comes with a 3 year warranty. I'm fine with that warranty length, as drives don't last forever, and I'll be replacing drives due to growth anyway.
Don't overlook RAID 1 - mirroring. With large enough drives this is a viable first step to some redundancy (though it's really intended more for failover). Simply replicating your data locally to multiple drives, and backing it up offsite should give a lot of redundancy.
The big challenge with local redundancy is that it's not backup, so replicated bad changes can wreck all local copies. Backup, however, gives you multiple copies of data and incremental changes (if configured that way).
I should check but i think i have 4/5x 1Tb NAS HDD, 1x1Tb enclosed SSD (now plugged in via ubs to the synology). Now that I think about it yes, I should probably buy some more but all my data is just 1/2 Tb in total.
Yea, buy three 4TB drives, one is master, the other 2 sync from master (can mirror or use a sync tool).
Then get a cloud backup service.
Shop for drives here.