I must say I am pretty happy with the backup solution here. It took a few years to find a setup I am happy with, but this one works:
- Storing important files and data on the Synology DS1515+, with ca 8 TB disk (effective raided size) and 2 SSD drives for cache. Using WD Red 5TB SOHO NAS SATA-600 drives as main storage.
- Using CrashPlan to add another layer of off-site backup for data on the DS1515+.
- CrashPlan running on the DS1515+ also receives backups from a bunch of other computers, both around here and for friends and family.