SharePoint Online

Good day,

I have been given a project to archive SharePoint data to free up space as running low, I need to move the data to a local Synology NAS with the ability to recover if needed.

I dont know SharePoint very well and not sure of the best solution, I have read that Synology can backup SharePoint but its very limited.

I would like to archive in two ways, manually to move know data this is archiable and automatically data over a certain age.

thanks in advance for any help

Julian