Replacing a failed drive mandatory?

My Cloud OS 3 Personal & Network Attached Storage My Cloud Mirror
1

Hi,
I have one question about My Cloud Mirror NAS. If one of the two disks fails (with RAID 1 setup), do you need to mandatorily replace the bad drive before you can access your data? Can you access your data from the second drive for few days before you purchase a new replacement drive?

2

Yes, your data will remain accessible.