This page describes how to restore mercury from mars after a catastrophic backup.
For example, we're going to restore the zettelkasten which is in /local/bonmot/z10
sudo root
RSYNC_PASSWORD=#### password is in Dan's password wallet under "mars / backup.bonmot.ca"
export RSYNC_PASSWORD
rsync -a -v -I --dry-run \ # archive mode, verbose, -I = always overwrite files
rsync://root@union-st.bonmot.ca/mercury/local/bonmot/z10/data/ \ # source
/local/bonmot/z10/data/ # destination
... and then remove --dry-run if that looks good.