edirom/backup-cron repository overview

⁠backup-cron

backup service via ssh/rsync

The script is supposed to run once a day and creates a new folder on the remote backup host for every day. Every new backup is derived from yesterday's backup by setting hard links. Afterwards rsync will update only the changed files (and delete the removed files!)

⁠Prerequisites

For this to work, we need the following parameters to be exported in the environment:

• BACKUP_TARGET_HOST
• BACKUP_TARGET_PATH
• BACKUP_SOURCE_PATH

If BACKUP_SOURCE_HOST is given as well, it will trigger the remote2remote backup. Otherwise, the default is to back up the
local data at BACKUP_SOURCE_PATH.

Second, you'll need a working SSH connection (with keyfiles) between localhost and both BACKUP_TARGET_HOST and BACKUP_SOURCE_HOST (if given). If given, the BACKUP_SOURCE_HOST will need to be able to connect to the BACKUP_TARGET_HOST, as well. All necessary files (keys and config) should be mounted into the container at /root/.ssh.

⁠Sample Docker Command

docker run --rm -it \
  -e "BACKUP_TARGET_HOST=myTargetHost" 
  -e "BACKUP_SOURCE_PATH=/source/to/backup/" 
  -e "BACKUP_TARGET_PATH=/target/path/" 
  -v /path/to/.ssh:/root/.ssh 
  -v /local/path/to/source:/source/to/backup
  edirom/backup-cron