Trickplay files are being created, but not for every video file. However, these files are sufficient to completely fill the /tmp directory to 100%. After that, various services no longer restart. So far, I haven’t found a setting in Jellyfin that influences this.
You could extend the filesystem if needed
Can you check /etc/default/jellyfin there is a setting for a temp directory
# temporary directory path; used to construct paths for short-lived temporary files
# the old default was $JELLYFIN_CACHE_DIR/temp; use that to restore previous behaviour,
# though it will have an additional jellyfin/ subdir appended
# otherwise, leave this commented
#TMPDIR="/tmp"
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Yes, jellyfin will cause trouble if you leave the temp directory on default, I had it completely break my system until I removed some files from /tmp that seemingly did not exist anyway.
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@Joulinar and @urostor, thanks a lot guys 
! After changing the /tmp-Dir for Jellyfin, dietpi-backup does its thing and afterwards all services restart successfully.
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