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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RAID does not protect your data, it protects data uptime.
RAID cannot ensure integrity (i.e bitrot protection). Its one and only purpose it to mitigate downtime.
ZFS or other software RAIDs can though. Does anyone stll use hardware raid anyways?
ZFS and BTRFS' integrity checks are entirely independent of whether you have redundancy or not. You don't need any sort of RAID to get that; it also works on a single disk.
The only thing that redundancy provides you here is immediate automatic repair if corruption is found. I've written about why that isn't as great as it sounds in another reply already.
Most other software RAID can not and does not protect integrity. It couldn't; there's no hashing. Data verification is extremely annoying to implement on the block level and has massive performance gotchas, so you wouldn't want that even if you could have it.