The Shared File Systems service provides a snapshot mechanism to help
users restore data by running the manila snapshot-create command.

To export a snapshot, create a share from it, then mount the new
share to an instance. Copy files from the attached share into the
archive.

To import a snapshot, create a new share with appropriate size,
attach it to instance, and then copy a file from the archive to the
attached file system.

Create a snapshot from the share:

$ manila snapshot-create Share1 --name Snapshot1 --description "Snapshot of Share1"
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| status      | creating                             |
| share_id    | aca648eb-8c03-4394-a5cc-755066b7eb66 |
| user_id     | 5c7bdb6eb0504d54a619acf8375c08ce     |
| description | Snapshot of Share1                   |
| created_at  | 2015-09-25T05:27:38.000000           |
| size        | 1                                    |
| share_proto | NFS                                  |
| id          | 962e8126-35c3-47bb-8c00-f0ee37f42ddd |
| project_id  | cadd7139bc3148b8973df097c0911016     |
| share_size  | 1                                    |
| name        | Snapshot1                            |
+-------------+--------------------------------------+

Update snapshot name or description if needed:

$ manila snapshot-rename Snapshot1 Snapshot_1 --description "Snapshot of Share1. Updated."

Check that status of a snapshot is available:

$ manila snapshot-show Snapshot1
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| status      | available                            |
| share_id    | aca648eb-8c03-4394-a5cc-755066b7eb66 |
| user_id     | 5c7bdb6eb0504d54a619acf8375c08ce     |
| name        | Snapshot1                            |
| created_at  | 2015-09-25T05:27:38.000000           |
| share_proto | NFS                                  |
| id          | 962e8126-35c3-47bb-8c00-f0ee37f42ddd |
| project_id  | cadd7139bc3148b8973df097c0911016     |
| size        | 1                                    |
| share_size  | 1                                    |
| description | Snapshot of Share1                   |
+-------------+--------------------------------------+

To create a copy of your data from a snapshot, use manila create with key
--snapshot-id. This creates a new share from an existing
snapshot. Create a share from a snapshot and check whether it is
available:

$ manila create nfs 1 --name Share2 --metadata source=snapshot --description "Share from a snapshot." --snapshot-id 962e8126-35c3-47bb-8c00-f0ee37f42ddd
+-----------------------------+--------------------------------------+
| Property                    | Value                                |
+-----------------------------+--------------------------------------+
| status                      | None                                 |
| share_type_name             | default                              |
| description                 | Share from a snapshot.               |
| availability_zone           | None                                 |
| share_network_id            | None                                 |
| export_locations            | []                                   |
| share_server_id             | None                                 |
| share_group_id              | None                                 |
| host                        | None                                 |
| snapshot_id                 | 962e8126-35c3-47bb-8c00-f0ee37f42ddd |
| is_public                   | False                                |
| task_state                  | None                                 |
| snapshot_support            | True                                 |
| id                          | b6b0617c-ea51-4450-848e-e7cff69238c7 |
| size                        | 1                                    |
| name                        | Share2                               |
| share_type                  | c0086582-30a6-4060-b096-a42ec9d66b86 |
| created_at                  | 2015-09-25T06:25:50.240417           |
| export_location             | None                                 |
| share_proto                 | NFS                                  |
| project_id                  | 20787a7ba11946adad976463b57d8a2f     |
| metadata                    | {u'source': u'snapshot'}             |
+-----------------------------+--------------------------------------+

$ manila show Share2
+-----------------------------+-------------------------------------------+
| Property                    | Value                                     |
+-----------------------------+-------------------------------------------+
| status                      | available                                 |
| share_type_name             | default                                   |
| description                 | Share from a snapshot.                    |
| availability_zone           | nova                                      |
| share_network_id            | 5c3cbabb-f4da-465f-bc7f-fadbe047b85a      |
| export_locations            | 10.254.0.3:/shares/share-1dc2a471-3d47-...|
| share_server_id             | 41b7829d-7f6b-4c96-aea5-d106c2959961      |
| share_group_id              | None                                      |
| host                        | manila@generic1#GENERIC1                  |
| snapshot_id                 | 962e8126-35c3-47bb-8c00-f0ee37f42ddd      |
| is_public                   | False                                     |
| task_state                  | None                                      |
| snapshot_support            | True                                      |
| id                          | b6b0617c-ea51-4450-848e-e7cff69238c7      |
| size                        | 1                                         |
| name                        | Share2                                    |
| share_type                  | c0086582-30a6-4060-b096-a42ec9d66b86      |
| created_at                  | 2015-09-25T06:25:50.000000                |
| share_proto                 | NFS                                       |
| project_id                  | 20787a7ba11946adad976463b57d8a2f          |
| metadata                    | {u'source': u'snapshot'}                  |
+-----------------------------+-------------------------------------------+

By default, the Shared File Systems service will place the new share
in the source share’s pool, unless a different destination availability
zone is provided by the user, using the key
--availability-zone.

Starting from Ussuri release, a new filter and weigher were added to
the scheduler to enhance the selection of a destination pool when
creating shares from snapshot. Drivers that support creating shares from
snapshots across back ends also need the back end configuration option
replication_domain to be specified. This option can be an
arbitrary string. As an administrator, you are expected to determine
which back ends are compatible to copy data between each other. Once you
have identified these back ends, configure
replication_domain in their respective configuration
sections to the same string. Refer to the feature support mapping <share_back_ends_feature_support_mapping>
for identifying which back ends support this feature. The use of
scheduler when creating share from a snapshot must be enabled using the
configuration flag
[DEFAULT]/use_scheduler_creating_share_from_snapshot. This
option is disabled by default.

You can soft-delete a snapshot using manila snapshot-delete
<snapshot_name_or_ID>. If a snapshot is in busy state, and
during the delete an error_deleting status appeared,
administrator can force-delete it or explicitly reset the state.

Use snapshot-reset-state [--state <state>] <snapshot>
to update the state of a snapshot explicitly. A valid value of a status
are available, error, creating,
deleting, error_deleting. If no state is
provided, the available state will be used.

Use manila snapshot-force-delete <snapshot> to
force-delete a specified share snapshot in any state.