How to create raid 1, or get information from disks?

Question

linux

Raised the server on debian8, installed the system on a separate disk. I took two WD disks from synology. There they were in raid1. I would like to re-enable disks in raid1 without erasing information from disks. Tell me how to do it.
if this is not possible, then at least extract the information from the disks.

cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdc5[0]
      2925531648 blocks super 1.2 [2/1] [U_]

unused devices: <none>

fdisk -l /dev/sdc /dev/sdb

Disk /dev/sdc: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 4ECEA6BB-8B09-43FC-9C8A-21FDF196DE0A

Device       Start        End    Sectors  Size Type
/dev/sdc1      256    4980735    4980480  2.4G Linux RAID
/dev/sdc2  4980736    9175039    4194304    2G Linux RAID
/dev/sdc5  9453280 5860519007 5851065728  2.7T Linux RAID

Disk /dev/sdb: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: C70DB86E-61C2-467C-87A5-98D4A0D372E0

Device       Start        End    Sectors  Size Type
/dev/sdb1      256    4980735    4980480  2.4G Linux RAID
/dev/sdb2  4980736    9175039    4194304    2G Linux RAID
/dev/sdb5  9453280 5860519007 5851065728  2.7T Linux RAID

if you try to mount md2 (as root):

/dev/md2 /mnt/sdc ext3 user,auto,rw 0 0
bash: /dev/md2: Permission denied

sudo mount /dev/md2
mount: can't find /dev/md2 in /etc/fstab

sudo mount /dev/sdb5
mount: can't find /dev/sdb5 in /etc/fstab

cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda1 during installation
UUID=1b3a35fe-723f-4b8c-ba04-ec8f58793bbe /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda5 during installation
UUID=116e0864-0d36-4d6a-b166-f0eae723d05b none            swap    sw              0       0
tmpfs           /tmp            tmpfs   defaults        0       0

Answer 1

mount md2 and copy the info.