Taking a snapshot is like taking a photo - within seconds the complete status of your NAS system and data is recorded. If an unexpected situation arises on your system, you can revert to the state recorded by a snapshot. With greater space-efficiency and flexibility compared to traditional backup methods, snapshots are the best way to protect your files and data.

Ransomware attacks continue to increase, and they indiscriminately target businesses, infrastructure, the public sector, non-profit organizations, and home users. QNAP NAS includes comprehensive backup features and supports point-in-time snapshots to help protect and restore important files/data and avoid downtime. If ransomware attacks or an unexpected situation arises on your system, simply revert your affected files or the entire system to the previous state that the snapshot has recorded.

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Snapshot Replica replicates snapshot files to the Snapshot Vault on the backup NAS for version control and management. It copies only the changes made since the last snapshot, helping to save you time and bandwidth, and can be run manually or on a scheduled basis. Snapshot files can be directly recovered and used in the backup NAS.

For initial replication, you can export the source data of snapshot files from the primary NAS to an external storage device. This device can then be physically moved and connected to the secondary NAS, allowing Snapshot Replica to run over the local network to save bandwidth and time compared to migrating via the Internet.

Real-time SnapSync immediately synchronizes modified data with the secondary NAS, ensuring that it is always identical with the primary NAS. If the primary NAS goes offline, IT staff can simply adjust the privilege settings of the secondary NAS for continuous operations, leading to no data loss. RPO is minimal to achieve real-time disaster recovery.

Remote backup and restoration enables double protection for minimal downtime. You can directly restore snapshot backups in a remote NAS to ensure continuity if the local NAS cannot function, or clone a volume/LUN snapshot as a volume or iSCSI LUN on the remote NAS.

A QNAP NAS will enter protection mode (where no more data can be written) if the available free space is less than 16GB. When using snapshots, you should use snapshot space management to prevent this situation from arising.

QNAP NAS operating systems support thin and thick volumes. As thick volumes allocate the total size of the volume upon creation, this can cause snapshots to require larger space and may lead to insufficient available pool space. On the other hand, snapshots with thin volumes only use space as needed and prevent ineffective storage utilization. Learn more

In short snapshots are versioning, or the ability to undo a change. If you take a snapshot every hour, for example, then all your files or folders can be reverted back to the state they were at the time of any of your snapshots. So, if you get a virus, then you can just revert your files, folders, or whole volume to the state it was before you got the virus

A backup is a complete copy of your data. So, if you have 5TB of data each copy will take up an additional 5TB of space. If you make a backup every 1 hour, then after just 10 hours, your backups would take 50TB of space. For this reason, it is not common to save many versions of your backups and backups are not good for versioning.

Snapshots are great for versioning because they are not backups and they can have many versions without taking up much space. A snapshot only needs to save enough information to undo a change and that makes it take less space than a backup.

Because your snapshot has the metadata, it can recognize what blocks of data have been added or changed since the creation of the snapshot. If you revert to one of your snapshots, every block of data that was added or changed since the snapshot was taken is removed from where it is saved in the snapshot. Then every block of data is as it was at the time the snapshot was taken. And since your files are made up of blocks of data, every file is now as it was when the snapshot was taken.

Because QNAP does block level snapshots, they are more space efficient than file level snapshots. With file level snapshots, if you make even a small change to a file, you need to save the whole file to the snapshot. But with block level snapshots, you only need to save the blocks within the file that have been changed.

Block level snapshots let you take snapshots of any volumes or LUNs on your NAS including a block level iSCSI LUN. Other snapshots that rely on BTRFS cannot do this because they can only take a snapshot of a volume & a thin LUN managed by the BTRFS file system.

QNAP built their snapshots from the ground up and gave you more control of how space for the snapshots is allocated. You control how much storage to reserve for the snapshots. And other files and applications will have priority over the space that you did not allocate to snapshots.

When you delete files, the snapshot needs to be able to restore the files you deleted. To do that, any block of data you delete and overwrite will be saved to the snapshot. Saving blocks of data to the snapshot takes much more space than just saving metadata. So, deleting files makes your snapshot size grow much more than adding file

I have a TS-453D with 4x6TB disks in it, set up with Thick volume. Would it be possible to add a external USB 3-drive for example a Seagate backup drive (external) where the snapshot is stored? If yes, how big disk would be needed?

Last question, could you put reference to how tutorial how to check for current setup of snapshot and how to set up snapshots on the system? When i browse to the QNAP and the shares i have on it i see a @Recently-Snapshot-camera together with @Recycle-bin , does this means i have it setup already or this there by default? Please advice me on this (or link to tutorial if you have one)

Hi Frank,

Your snapshot needs to be stored in the NAS storage pool first. You can then export the stored snapshot as a backup.

To resize the volume, follow the steps in the below image. Thanks.

Hi Michael,

Thank you so much for getting back to me regarding the steps to resize, i really appreciate that. The screenshot is a bit tiny so i am not able to make out all the steps given here, but i think i will manage roughly.

Question 1: Based on my previous statement, of 4x6TB disk, what size do you recommend me to shrink down the volume to? I would like to maximize my storage volume, but at same time accomplish for good space for snapshots?

Unfortunately I got an error while doing the second step (see attached file).

I suppose this is due to the fact that the mounted lun snapshot has the same uuid of the "source" SR.

Before continuing trying... I wonder if someone can point me to a procedure/tutorial/howto to do a restore of a single VM starting from a lun snapshot.

Thanks in advance.

You probably only have two choicess: 1) temporarily detach the current iSCSI LUN associated with that SR to be able to bring in the snapshot version and then move the VM to local storage temporraily before reversing the process, or 2) attach the LUN to an unrelated host or pool to be able to pull in the VM. 152ee80cbc

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