snapshot.sh | Bash script for versioned snapshots using rsync | Continuous Backup library

snapshot.sh is a Shell library typically used in Backup Recovery, Continuous Backup, Docker applications. snapshot.sh has no bugs, it has no vulnerabilities, it has a Weak Copyleft License and it has low support. You can download it from GitHub.

Bash script for versioned snapshots using rsync, with purging. This is how I do my first level automatic backups of my servers. I run a couple of Odroid HC2 ARM SBCs with the Openmediavault NAS software and a 12TB drive. nas0 to nas5. I run them in pairs where the first NAS in the pair is used to share files on my LAN and the second NAS in the pair is used to take daily automatic versioned backup snapshots of the first NAS. I use a couple of bash-scripts, one per major folder on the NAS. And I have a cron job setup to, at 03:00, run a "master script" that in turn run all the snapshot scripts. All my NAS are connected to each other using GbE, NFS4 and autofs. The autofs mounts are in /srv/nfs/nas#. I have a separate script for each backup job. The scripts are all identical except for some paths, names and constants modified at the beginning of the script. As can be seen above this script was used to update a snapshot of local_media from nas0 to nas1. And snapshots are automatically purged so that no more than 7 daily, 4 weekly and 4 monthly snapshots are retained. The script creates a full snapshot backup copy by hardlinking unmodified files from the previous snapshot and copying over only modified files, if any. This means that the script is usually very fast. A snapshot with several TB of data and many thousands of files and folders can be updated in about a minute or so, if no files need to be copied. The script, as it is here, uses rsync in local mode. It might be used between two filesystems on the same server or on two servers via a NFS mount. But it should also be very easy to modify the script to run on the backup server and create snapshots of a remote server over ssh. This is of course inspired by "Easy Automated Snapshots, Mike Rubel".