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README.md

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-# ZFS autobackup
+# ZFS autobackup v3 - TEST VERSION
 
-Introduction
-============
-
-ZFS autobackup is used to periodicly backup ZFS filesystems to other locations. This is done using the very effcient zfs send and receive commands.
-
-It has the following features:
-* Automaticly selects filesystems to backup by looking at a simple ZFS property.
-* Creates consistent snapshots.
-* Multiple backups modes:
-  * "push" local data to a backup-server via SSH.
-  * "pull" remote data from a server via SSH and backup it locally.
-  * Backup local data on the same server.
-* Can be scheduled via a simple cronjob or run directly from commandline.
-* Supports resuming of interrupted transfers. (via the zfs extensible_dataset feature)
-* Backups and snapshots can be named to prevent conflicts. (multiple backups from and to the same filesystems are no problem)
-* Always creates a new snapshot before starting.
-* Checks everything and aborts on errors.
-* Ability to 'finish' aborted backups to see what goes wrong.
-* Easy to debug and has a test-mode. Actual unix commands are printed.
-* Keeps latest X snapshots remote and locally. (default 30, configurable)
-* Easy installation:
-  * Only one host needs the zfs_autobackup script. The other host just needs ssh and the zfs command.
-  * Written in python and uses zfs-commands, no 3rd party dependencys or libraries.
-
-Usage
-====
-```
-usage: zfs_autobackup [-h] [--ssh-source SSH_SOURCE] [--ssh-target SSH_TARGET]
-                      [--ssh-cipher SSH_CIPHER] [--keep-source KEEP_SOURCE]
-                      [--keep-target KEEP_TARGET] [--no-snapshot] [--no-send]
-                      [--resume] [--strip-path STRIP_PATH] [--destroy-stale]
-                      [--clear-refreservation] [--clear-mountpoint]
-                      [--rollback] [--compress] [--test] [--verbose] [--debug]
-                      backup_name target_fs
-
-ZFS autobackup v2.1
-
-positional arguments:
-  backup_name           Name of the backup (you should set the zfs property
-                        "autobackup:backup-name" to true on filesystems you
-                        want to backup
-  target_fs             Target filesystem
-
-optional arguments:
-  -h, --help            show this help message and exit
-  --ssh-source SSH_SOURCE
-                        Source host to get backup from. (user@hostname)
-                        Default local.
-  --ssh-target SSH_TARGET
-                        Target host to push backup to. (user@hostname) Default
-                        local.
-  --ssh-cipher SSH_CIPHER
-                        SSH cipher to use (default None)
-  --keep-source KEEP_SOURCE
-                        Number of days to keep old snapshots on source.
-                        Default 30.
-  --keep-target KEEP_TARGET
-                        Number of days to keep old snapshots on target.
-                        Default 30.
-  --no-snapshot         dont create new snapshot (usefull for finishing
-                        uncompleted backups, or cleanups)
-  --no-send             dont send snapshots (usefull to only do a cleanup)
-  --resume              support resuming of interrupted transfers by using the
-                        zfs extensible_dataset feature (both zpools should
-                        have it enabled)
-  --strip-path STRIP_PATH
-                        number of directory to strip from path (use 1 when
-                        cloning zones between 2 SmartOS machines)
-  --destroy-stale       Destroy stale backups that have no more snapshots. Be
-                        sure to verify the output before using this!
-  --clear-refreservation
-                        Set refreservation property to none for new
-                        filesystems. Usefull when backupping SmartOS volumes.
-                        (recommended)
-  --clear-mountpoint    Sets canmount=noauto property, to prevent the received
-                        filesystem from mounting over existing filesystems.
-                        (recommended)
-  --rollback            Rollback changes on the target before starting a
-                        backup. (normally you can prevent changes by setting
-                        the readonly property on the target_fs to on)
-  --compress            use compression during zfs send/recv
-  --test                dont change anything, just show what would be done
-                        (still does all read-only operations)
-  --verbose             verbose output
-  --debug               debug output (shows commands that are executed)
-```
-
-Backup example
-==============
-
-In this example we're going to backup a SmartOS machine called `smartos01` to our fileserver called `fs1`.
-
-Its important to choose a unique and consistent backup name. In this case we name our backup: `smartos01_fs1`.
-
-Select filesystems to backup
-----------------------------
-
-On the source zfs system set the ```autobackup:smartos01_fs1``` zfs property to true:
-```
-[root@smartos01 ~]# zfs set autobackup:smartos01_fs1=true zones
-[root@smartos01 ~]# zfs get -t filesystem autobackup:smartos01_fs1
-NAME                                                PROPERTY                  VALUE                     SOURCE
-zones                                               autobackup:smartos01_fs1  true                      local
-zones/1eb33958-72c1-11e4-af42-ff0790f603dd          autobackup:smartos01_fs1  true                      inherited from zones
-zones/3c71a6cd-6857-407c-880c-09225ce4208e          autobackup:smartos01_fs1  true                      inherited from zones
-zones/3c905e49-81c0-4a5a-91c3-fc7996f97d47          autobackup:smartos01_fs1  true                      inherited from zones
-...
-```
-
-Because we dont want to backup everything, we can exclude certain filesystem by setting the property to false:
-```
-[root@smartos01 ~]# zfs set autobackup:smartos01_fs1=false zones/backup
-[root@smartos01 ~]# zfs get -t filesystem autobackup:smartos01_fs1
-NAME                                                PROPERTY                  VALUE                     SOURCE
-zones                                               autobackup:smartos01_fs1  true                      local
-zones/1eb33958-72c1-11e4-af42-ff0790f603dd          autobackup:smartos01_fs1  true                      inherited from zones
-...
-zones/backup                                        autobackup:smartos01_fs1  false                     local
-zones/backup/fs1                                    autobackup:smartos01_fs1  false                     inherited from zones/backup
-...
-```
-
-
-Running zfs_autobackup
-----------------------
-There are 2 ways to run the backup, but the endresult is always the same. Its just a matter of security (trust relations between the servers) and preference.
-
-First install the ssh-key on the server that you specify with --ssh-source or --ssh-target.
-
-Method 1: Run the script on the backup server and pull the data from the server specfied by --ssh-source. This is usually the preferred way and prevents a hacked server from accesing the backup-data:
-```
-root@fs1:/home/psy# ./zfs_autobackup --ssh-source root@1.2.3.4 smartos01_fs1 fs1/zones/backup/zfsbackups/smartos01.server.com --verbose --compress
-Getting selected source filesystems for backup smartos01_fs1 on root@1.2.3.4
-Selected: zones (direct selection)
-Selected: zones/1eb33958-72c1-11e4-af42-ff0790f603dd (inherited selection)
-Selected: zones/325dbc5e-2b90-11e3-8a3e-bfdcb1582a8d (inherited selection)
-...
-Ignoring: zones/backup (disabled)
-Ignoring: zones/backup/fs1 (disabled)
-...
-Creating source snapshot smartos01_fs1-20151030203738 on root@1.2.3.4
-Getting source snapshot-list from root@1.2.3.4
-Getting target snapshot-list from local
-Tranferring zones incremental backup between snapshots smartos01_fs1-20151030175345...smartos01_fs1-20151030203738
-...
-received 1.09MB stream in 1 seconds (1.09MB/sec)
-Destroying old snapshots on source
-Destroying old snapshots on target
-All done
-```
-
-Method 2: Run the script on the server and push the data to the backup server specified by --ssh-target:
-```
-./zfs_autobackup --ssh-target root@2.2.2.2 smartos01_fs1 fs1/zones/backup/zfsbackups/smartos01.server.com --verbose  --compress
-...
-All done
-
-```
-
-Tips
-----
-
- * Set the ```readonly``` property of the target filesystem to ```on```. This prevents changes on the target side. If there are changes the next backup will fail and will require a zfs rollback. (by using the --rollback option for example)
- * Use ```--clear-refreservation``` to save space on your backup server.
- * Use ```--clear-mountpoint``` to prevent the target server from mounting the backupped filesystem in the wrong place during a reboot. If this happens on systems like SmartOS or Openindia, svc://filesystem/local wont be able to mount some stuff and you need to resolve these issues on the console.
-
-Restore example
-===============
-
-Restoring can be done with simple zfs commands. For example, use this to restore a specific SmartOS disk image to a temporary restore location:
-
-
-```
-root@fs1:/home/psy#  zfs send fs1/zones/backup/zfsbackups/smartos01.server.com/zones/a3abd6c8-24c6-4125-9e35-192e2eca5908-disk0@smartos01_fs1-20160110000003 | ssh root@2.2.2.2 "zfs recv zones/restore"
-```
-
-After that you can rename the disk image from the temporary location to the location of a new SmartOS machine you've created.
-
-Snapshotting example
-====================
-
-Sending huge snapshots cant be resumed when a connection is interrupted: Next time zfs_autobackup is started, the whole snapshot will be transferred again. For this reason you might want to have multiple small snapshots.
-
-The --no-send option can be usefull for this. This way you can already create small snapshots every few hours:
-````
-[root@smartos2 ~]# zfs_autobackup --ssh-source root@smartos1 smartos1_freenas1 zones --verbose --ssh-cipher chacha20-poly1305@openssh.com --no-send
-````
-
-Later when our freenas1 server is ready we can use the same command without the --no-send at freenas1. At that point the server will receive all the small snapshots up to that point.
-
-
-
-Monitoring with Zabbix-jobs
-===========================
-
-You can monitor backups by using my zabbix-jobs script. (https://github.com/psy0rz/stuff/tree/master/zabbix-jobs)
-
-Put this command directly after the zfs_backup command in your cronjob:
-```
-zabbix-job-status backup_smartos01_fs1 daily $?
-```
-
-This will update the zabbix server with the exitcode and will also alert you if the job didnt run for more than 2 days.
+New in v3:
+ * Complete rewrite, cleaner object oriented code.
+ * Python 3 and 2 support.
+ * Backwards compatible with your current backups and parameters.
+ * Progressive thinning (via a destroy schedule. default schedule should be fine for most people)
+ * Cleaner output, with optional color support (pip install colorama). 
+   * Clear distinction between local and remote output.
+   * Summary at the beginning, displaying what will happen and the current thinning-schedule.
+ * More effient destroying/skipping snaphots on the fly. (no more space issues if your backup is way behind)
+ * Progress indicator (--progress)
+ * Better property management (--set-properties and --filter-properties)
+ * Better resume handling, automaticly abort invalid resumes.
+ * More robust error handling.
+ * Prepared for future enhanchements.