Something that really bothers me is silent data corruption. Over the years, I experienced it many times that suddenly you want to open some old pictures just to scratch your head and wonder wether there wasn't another photo in that folder. I store all my project files and pictures in my dropbox and have additionally an external RAID 1 disk (WDMyBookMirror) where I backup these files to. About a year ago I had upgraded from an older MyBook Mirror to a new one. The old one was still lying around with the old data, and I decided to run a comparison with FileMerge of the folder trees of the old disk with the current state of my new Backup disk that is in use. Turns out about 10 files have disappeared in this one year or so from my new disk. Random photos and videos. If I hadn't run the comparison, I would never have noticed.
This gets me to the question. How can I store my data to be really sure that I'm not losing any files without noticing?
Apparently the RAID 1 didn't safe me from the silent data corruption. Neither did the NTFS file system on it, and a cloud solution such as dropbox would probably just sync the erroneous file changes into the cloud, corrupting/losing the data in other places too. Creating regular backups of the backup also won't inform me about pictures silently lost or corrupted.
So, what to do? I read a bit about ReFS and ZFS. Is that the way to go?
I don't mind paying for redundancy - but what's the way to store my data so I can be SURE that silent data corruption can't happen?