Can someone please help me out here!

I am planning to buy Ugreen NAS200 and want to optimize it for both speed and long-term safety. Can I set up a 2TB SSD in Slot 1 for fast daily uploads/downloads and a 2TB HDD in Slot 2 for redundancy? Specifically:

• Does the Ugreen OS (UGOS) allow mixing an SSD and HDD in a RAID 1 (Mirror) configuration for data protection?
• If I mix them, will the SSD's speed be capped by the slower HDD?
• If RAID 1 isn't recommended for mixed drives, is there a way to automatically sync or back up the SSD data to the HDD daily for safety?

I am not a power user, just want to save pictures/videos taken from phone, that wont be too often.