from the screenshot your Nextcloud is accessing /mnt/ncdata- not sure it is the same as your /mnt/datayou are looking at. size is similar likely the same but just to be sure. it is expected different tools show different space usage e.g. some commands ignore hidden files and maybe FS overhead, which seems to be the case for your df -h - total size of 16T, 161MB and 1% usage don’t really match 15T free.
to have better overview of the effective storage I would recommend using du -hs command (there are also option to shown how deep it should go)
Hello, I have the same problem. NextCloud tells me I only have 5 GB of storage, even though it should be 1 TB. I recently updated, so maybe that has something to do with it? I should also mention, though: I know nothing about IT. I just want to get away from iCloud, and I was recommended Hetzner Storage Share. And now, after just a few days, nothing works anymore…
you are aware that (modern) filesystems require metadata? i think the default for ext4 ist ~5% which seems about right for the fs on sdb.
you can reduce that percentage at fs-creation at the price of less fs-resilience. unless you are really hard-pressed for space i wouldn’t recommend it., though.
GOOD LUCK!