zfs-auto-snapshot:

An alternative implementation of the zfs-auto-snapshot service for Linux
that is compatible with zfs-linux and zfs-fuse.

Automatically create, rotate, and destroy periodic ZFS snapshots. This is
the utility that creates the @zfs-auto-snap_frequent, @zfs-auto-snap_hourly,
@zfs-auto-snap_daily, @zfs-auto-snap_weekly, and @zfs-auto-snap_monthly
snapshots if it is installed.

This program is a posixly correct bourne shell script.  It depends only on
the zfs utilities and cron, and can run in the dash shell.


Installation:
-------------

wget https://github.com/ArakniD/zfs-auto-snapshot/archive/master.zip
unzip master.zip
cd zfs-auto-snapshot-master
make install

Usage:
------

Samba and "Previous Versions":
------------------------------

Configure Cron.d job such that there are individual labels for each time increment;

  PATH="/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin"
  
  # Every 15 minutes (skip hourly)
  15,30,45 * * * * root which zfs-auto-snapshot > /dev/null || exit 0 ; zfs-auto-snapshot --quiet --syslog --label=00 --keep=6  trunk/PATH
  # Every 1 hour (skip midnight)
  0 1-23 * * *     root which zfs-auto-snapshot > /dev/null || exit 0 ; zfs-auto-snapshot --quiet --syslog --label=01 --keep=23 trunk/PATH

Configure your samba config file so that the label and the date-time are what makes up your uniquie index, UTC date time

  [ShareName]
    vfs objects = shadow_copy2
    shadow: snapdir = .zfs/snapshot
    shadow: sort = desc
    shadow: format = zfs-auto-snap_%S-%Y-%m-%d-%H%M
    shadow: localtime = no

Also configure the .zfs folder to be visible in the filesystem to enable the "Right Click -> Previous Versions" dialog to work in Windows.

Snapshow Send / Recv to local or Remote host:
--------------------------------------------

Add a cron.d job that sends an incremental snapshot from your main host? to a backup or shadow host

  PATH="/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin"
  
  # Every 1 day  3am 
  0 3 * * *      root which zfs-auto-snapshot > /dev/null || exit 0 ; zfs-auto-snapshot --quiet --syslog --keep=30 --event=backups --recv-opts=-u --prefix=shadow --label=daily --verbose --send-incr=trunk/PATH shadow/PATH