EUR269,– EUR26,90/1TB
WD Red Plus
10 TB, 3.5", CMR
WD Red Plus
10 TB, 3.5", CMR
Which raid mode is currently active? RAID 5 or RAID 6?
Yes, that's no problem, with Synology you can swap one disc for the next and replace it with a larger disc. With the DS1513+, however, the question would also be whether one could not offer the whole DS1513+ with the 4TB discs via Tutti or Ricardo or even if bought at Digitec via Digitec.
I would then buy this new DS1522+, it is not very expensive (you can finance part of it with the sale of the DS1513+), but it gets very long support and you can then build the new NAS with the large disks, perhaps even continue to use the old one as a backup.