Automatic Snapshot configuration and scheduling<\/strong><\/p>\n\n\n\nSnapshots are an interesting feature of the ZFS file system. After the initial snapshot, the new snapshots do not actually copy the new \/ added \/ modified files, but take a “differential” of the original snapshot resulting in a massive reduction in the size of the subsequent new snapshots, taking less time to record new snapshots and then improve the system performance.<\/p>\n\n\n\n
Snapshots can be understood as “photographs” that capture the status of the data up to a certain instant of time. This data will then be kept until all snapshots are deleted.<\/p>\n\n\n\n
If all the snapshots, which protect that data are removed, you will obviously lose the history of the changes remaining therefore with the data at present.<\/p>\n\n\n\n
You can return to the most recent snapshot by cloning or rolling back.<\/p>\n\n\n\n
“Think of snapshots as a fast and efficient process for restoring a file \/ directory in a previous \/ original version or in a state.”<\/em><\/p>\n\n\n\nWe can return to any “cloning” snapshot [term used by TrueNAS – ed]. Cloning is like “mounting” a snapshot in a new location (you need to provide the path on the file system).<\/p>\n\n\n\n
After creating a test dataset, we will configure a periodic snapshot for this dataset. Then we will add \/ modify files and roll back \/ clone to the state \/ previous version of the data status.<\/p>\n\n\n\n
It is immediately clear how useful this process can be when our data is compromised or even worse if it is encrypted by a Ransomware.<\/p>\n\n\n\n
Let’s start by configuring an automatic snapshot creation task.<\/p>\n\n\n\n
Let’s go to Task <\/strong>-> Periodic Snapshot Task -> ADD<\/strong><\/p>\n\n\n\nWe can configure:<\/p>\n\n\n\n
The whole Pool or the dataset that interests us.<\/li> The lifetime of the snapshot (“Snapshot Lifetime”).<\/li> The beginning and end of the time frame in which to take snapshots.<\/li> How often to take the snapshot (“Interval”).<\/li> The days of the week in which to perform the task.<\/li><\/ul>\n\n\n\nIn order to manage the snapshots we have created, we need to go to Storage<\/strong> -> Snapshot<\/strong>.<\/p>\n\n\n\nEach dataset \/ pool will have its own snapshot and we will be able to choose which one to restore.<\/p>\n\n\n\n
To restore the snapshot we can follow 2 roads:<\/p>\n\n\n\n
Execute a clone: restore the snapshot in a portion of the file system and therefore storage that we are going to dedicate. In this case no other changes will be made but we will have a situation in which the snapshot will be restored parallel to the “current status”.<\/li> Rollback: restore the snapshot by overwriting it to the current state of the dataset data to which it refers. Pay attention to the fact that all changes subsequent to the creation of the snapshot will be lost, as will all the snapshots created after the restored snapshot.<\/li><\/ul>\n\n\n\nClone<\/strong><\/p>\n\n\n\nClick on the 3 balls of the snapshot we want to clone and select “Clone”.<\/p>\n\n\n\n
At this point we will be asked to select the path where we want the clone to be restored.<\/p>\n\n\n\nFor example, we can create it within our shared dataset to be able to access it remotely and make a more convenient consultation.<\/p>\n\n\n\nRollback<\/strong><\/p>\n\n\n\nClick on the 3 balls of the snapshot that we want to clone and select “Rollback”<\/p>\n\n\n\n
We will therefore be warned of the consequences and irreversibility of the process.<\/p>\n\n\n\nOnce a snapshot has been rolled back it should be considered that the permissions in the restored snapshot are also restored.<\/p>\n\n\n\n
CONCLUSION<\/strong><\/p>\n\n\n\nBeing able to rely on a certain number of snapshots can be very useful if our data is compromised by Ransomware like Cryptolocker or by other elements that could alter them.<\/p>\n\n\n\n
As a method it might be more convenient to first make a snapshot clone, perhaps in an isolated storage or in the event that all our data is encrypted, so that we can consult the content and decide whether to roll back the desired datasets.<\/p>\n","protected":false},"excerpt":{"rendered":"
How to choose the right hardware to take advantage of all the features of FreeNAS.<\/p>\n","protected":false},"author":11,"featured_media":25775,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[231],"tags":[232],"class_list":["post-18374","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-truenas","tag-freenas-en"],"_links":{"self":[{"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/posts\/18374","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/comments?post=18374"}],"version-history":[{"count":21,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/posts\/18374\/revisions"}],"predecessor-version":[{"id":25778,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/posts\/18374\/revisions\/25778"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/media\/25775"}],"wp:attachment":[{"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/media?parent=18374"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/categories?post=18374"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.miniserver.it\/en\/wp-json\/wp\/v2\/tags?post=18374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\"](\"https:\/\/blog.miniserver.it\/wp-content\/uploads\/\/TrueNAS-Dataset-1024x352.png\")
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