Window content backup script from Victor J Orlikowski.

examples/tmux_backup.sh

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+#!/bin/bash
+#
+# By Victor Orlikowski. Public domain.
+#
+# This script maintains snapshots of each pane's
+# history buffer, for each tmux session you are running.
+# 
+# It is intended to be run by cron, on whatever interval works
+# for you.
+
+# Maximum number of snapshots to keep.
+max_backups=12
+# Names of sessions you may wish to exclude from snapshotting,
+# space separated.
+ignore_sessions=""
+# The directory into which you want your snapshots placed.
+# The default is probably "good enough."
+backup_dir=~/.tmux_backup/snapshot
+
+########################################################################
+
+# Rotate previous backups.
+i=${max_backups}
+while [[ ${i} != 0 ]] ; do
+if [ -d ${backup_dir}.${i} ] ; then
+  if [[ ${i} = ${max_backups} ]] ; then
+    rm -r ${backup_dir}.${i}
+  else
+    mv ${backup_dir}.${i} ${backup_dir}.$((${i}+1))
+  fi
+fi
+i=$((${i}-1))
+done
+
+if [ -d ${backup_dir} ] ; then
+  mv ${backup_dir} ${backup_dir}.1
+fi
+
+## Dump hardcopy from all windows in all available tmux sessions.
+unset TMUX
+for session in $(tmux list-sessions | cut -d' ' -f1 | sed -e 's/:$//') ; do
+  for ignore_session in ${ignore_sessions} ; do
+    if [ ${session} = ${ignore_session} ] ; then
+      continue 2
+    fi
+  done
+
+  # Session name can contain the colon character (":").
+  # This can screw up addressing of windows within tmux, since
+  # target windows are specified as target-session:target-window.
+  #
+  # We use uuidgen to create a "safe" temporary session name,
+  # which we then use to create a "detached" session that "links"
+  # to the "real" session that we want to back up.
+  tmpsession=$(uuidgen)
+  tmux new-session -d -s "$tmpsession" -t "$session"
+  HISTSIZE=$(tmux show-options -g -t "$tmpsession" | grep "history-limit" | awk '{print $2}')
+  for win in $(tmux list-windows -t "$tmpsession" | grep -v "^\s" | cut -d' ' -f1 | sed -e 's/:$//'); do
+    session_dir=$(echo "$session" | sed -e 's/ /_/g' | sed -e 's%/%|%g')
+    win_spec="$tmpsession":"$win"
+
+    if [ ! -d ${backup_dir}/${session_dir}/${win} ] ; then
+      mkdir -p ${backup_dir}/${session_dir}/${win}
+    fi
+
+    for pane in $(tmux list-panes -t "$win_spec" | cut -d' ' -f1 | sed -e 's/:$//'); do
+      pane_path=${backup_dir}/${session_dir}/${win}/${pane}
+      pane_spec="$win_spec"."$pane"
+
+      tmux capture-pane -t "$pane_spec" -S -${HISTSIZE}
+      tmux save-buffer ${pane_path}
+
+      if [ ! -s ${pane_path} ] ; then
+        sleep 1
+        rm ${pane_path}
+      fi
+    done
+  done
+  tmux kill-session -t "$tmpsession"
+
+done