After 3 years being 24/7, my DS1815+ does not turn on anymore when I press the power button. The problem is not with the power supply. I did change it, but with no luck.

Fortunatelly, I was using Hyper Backup to daily compy everything into “Synology C2 backup”. 

But it’s not possible to retreive a complete foder from the backup via the Synology C2 web page. One can only download file by file 🙁

To download a complete folder at once, you need the “Synology Hyper Backup Explorer” for desktop available in the Destkop Utilities section of the downloads.