From then on, any time you change a block of data, that block is written to a designated snapshot space. This takes very little space and the snapshot is created very quickly. When you take a snapshot, the metadata recording where each block of data is stored is copied to the snapshot. How do QNAP’s block-level snapshots work? A snapshot only needs to save enough information to undo a change and that makes it take less space than a backup. Snapshots are great for versioning because they are not backups and they can have many versions without taking up much space.
For this reason, it is not common to save many versions of your backups and backups are not good for versioning. If you make a backup every 1 hour, then after just 10 hours, your backups would take 50TB of space. So, if you have 5TB of data each copy will take up an additional 5TB of space. 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 How is this different than a backup?Ī backup is a complete copy of your data. 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. In short snapshots are versioning, or the ability to undo a change. Control snapshot space allocation to keep your NAS functional:.What is good about the way QNAP does snapshots?.How do QNAP’s block-level snapshots work?.
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