I'm more of a hobbyist that does occasional pro work ad hoc. I don't really trust consumer grade RAID units anymore. I have had two different 2-drive external HDD units fail over the past few years. I had both set up as RAID 1.
When a drive went bad in the first unit, I found that I could not just pull out the remaining drive, put it in a reader, and get files off it using Windows. I had to buy software to read the file structure and retrieve the files, but at least I got my data back.
When a drive went bad in the second unit, I replaced the dead drive with a replacement unit from the manufacturer which was supposed to initiate an automatic reconstruction... but that didn't happen and it just sat there giving me an error. I ended up pulling out the remaining drive and was able to read it in Windows directly, but then that drive also started to respond slowly and I ended up only retrieving about 10% of my data before that drive died.
Now I have 4 independent 4TB drives in my desktop (D, E, F, G drives), which I use in two 2-drive pairs. I only directly work with files on my D and F drives. Then every evening I have Cobian Backup copy all the changes from D to E, and F to G. This doesn't protect so well against data corruption, but Cobian doesn't actually mirror, so if a file on one drive gets corrupted, it stands to reason that the matching file on the second drive might be okay.
I also use Backblaze for ongoing cloud backup.
I do have an older 12TB RAID that I bought about 6 years ago, set up as RAID 5 and just put copies of my files on that one since I have it, but I don't really consider it as part of my main backup routine anymore.
When a drive went bad in the first unit, I found that I could not just pull out the remaining drive, put it in a reader, and get files off it using Windows. I had to buy software to read the file structure and retrieve the files, but at least I got my data back.
When a drive went bad in the second unit, I replaced the dead drive with a replacement unit from the manufacturer which was supposed to initiate an automatic reconstruction... but that didn't happen and it just sat there giving me an error. I ended up pulling out the remaining drive and was able to read it in Windows directly, but then that drive also started to respond slowly and I ended up only retrieving about 10% of my data before that drive died.
Now I have 4 independent 4TB drives in my desktop (D, E, F, G drives), which I use in two 2-drive pairs. I only directly work with files on my D and F drives. Then every evening I have Cobian Backup copy all the changes from D to E, and F to G. This doesn't protect so well against data corruption, but Cobian doesn't actually mirror, so if a file on one drive gets corrupted, it stands to reason that the matching file on the second drive might be okay.
I also use Backblaze for ongoing cloud backup.
I do have an older 12TB RAID that I bought about 6 years ago, set up as RAID 5 and just put copies of my files on that one since I have it, but I don't really consider it as part of my main backup routine anymore.