filesystem full showing -29G

Hello,

I've a bunch of external USB disks to where I copy every month the
following three files, last on September 20:

-r--------  1 root wheel   70G 20 sept. 10:34 guru-20240920.tar.gz
-r--r-----  1 root wheel   62B 20 sept. 10:44 guru-20240920.tar.gz.md5
-r--r-----  1 root wheel   59M 20 sept. 10:52 guru-20240920.tar.gz.lst

The suffixes say what they contain, esp. the MD5 hash of the tar
archive.

The yesterday's copy ended up with no space left on device. The curious
thing is that it shows -29G:

# df -kh /mnt/backups/
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p4    652G    629G    -29G   105%    /mnt

How is this possible?

I will later re-calculate the MD5 hash of the last tar archive guru-20240920.tar.gz
and compare it with what is stored in guru-20240920.tar.gz.md5

Thanks

	matthias

-- 
Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045
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Annalena Baerbock: "We are fighting a war against Russia ..." (25.1.2023)

I, Matthias, I am not at war with Russia.
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Ich bin nicht im Krieg mit Russland.