A very useful guide from NAS Compares if you're a Mac user and would like to use Time Machine to backup to Synology NAS.
And another one from Storage Alchemist:
How to Back up your Mac to Synology NAS with Time Machine
A Guide to Using Apple Time Machine and your NAS Apple Time Machine is a backup software application included with macOS operating system from Apple. The software is designed to work with their range of AirPort Time Capsule devices, the Wi-Fi router with built-in hard disk (which apple are pulling
nascompares.com
And another one from Storage Alchemist:
Time Machine Backup To Synology NAS - Storage Alchemist
Making a Time Machine backup from your Mac to a Synology NAS is very convenient and easy to setup. Find a step-by-step guidance in this post.
www.storagealchemist.com