We will get back to this later in more detail. If you hover over the “i” you see the explanation.
De default setting advised by Synology is “Smart Recycle”. In present days it could help to export a full system to an hard disk to be sent to C2 or another external Hyper Backup Vault. There are not many reasons to do so, but one of them in the past was to export your system to move/migrate it to another system (but now we have the Synology Migration Package). If you do NOT enable Rotation, every time this task runs, that backup will never ever be deleted, it will occupy all the storage it needs and will never free up storage. 
So, let’s go to the tab This is the default and what does it do: So, when you create a new job, ask yourself “is it a or an ?” With the selection of “Folders” in combination with the “File Filter” you can accomplish this distinction and have one Task for “Backup” and one Task for “Archive”.
Archive – store a file to be sure you will never ever lose it. Think of financial records you need to keep for like 5 to 7 years Backup – store a file for a period of time to make sure you can restore from. The “Rotation Settings” make sure your available storage stays in sync with the files you need to archive/backup. If you have read this piece you’ll understand the same applies to the other products that use the same “Rotation Settings”. This means: Have three copies of your data, at least on two different media of wich one should be remote. There is one last thing I need to add to this general paragraph as it is important. 
This can be a USB disk, another NAS/storage or a Cloud Service. Hyper Backup makes a backup of your NAS to an external device. But first a general remark: As Synology users, we know Hyper Backup. I’d like to shed some light on the “Rotation Settings” and the considerations you should know to take care of.
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