make snapshots with rsync and an union-mount filesystem without hardlinks
show du via esp8266 and servo
compare 2 lists of files from the same FS, get size of deletions, updates, inserts
pg_upgrade inside docker
convert HEIC-Format to JPEG
log maintainence jobs on servers
klarschiff analytics
migrate docker container to docker-compose.yml
managing and sharing secrets using a- and symmetric encryption