Time Machine encryption - after restart, drive won't mount

Hi all.
I enabled Time Machine on my Drobo drive, enabling encryption. All was good, Time Machine started encrypting away.
I restarted my Mac, and now my Drobo won't mount.
In Disk Utility, it looks like this:
I'm unable to verify, repair or mount the disk.
I wasn't prompted for the Time Machine encryption key, I assume that this is stored in my Keychain and unlocked on the fly?
But regardless - I'm unsure of what to do next! I've got quite a bit of data on the drobo, and didn't expect it to render the drive completley useless. I'll be gutted if I lose my files on my Drobo besides the Time Machine backup I had.
Any help, suggestions, advice would be much appreciated.
Update: Output from Disk Utility when trying to verify the drive:
Verifying partition map for “Drobo”
Checking prerequisites
Checking the partition list
Checking for an EFI system partition
Checking the EFI system partition’s size
Checking the EFI system partition’s file system
Checking all HFS data partition loader spaces
Checking Core Storage Physical Volume partitions
Checking storage system
Checking volume.
disk1s2: Scan for Volume Headers
Invalid Volume Header @ 8795614850560: unsupported format
disk1s2: Scan for Disk Labels
Invalid Disk Label @ 8795598069760: cksum mismatch
Invalid Disk Label @ 8795602264064: cksum mismatch
Invalid Disk Label @ 8795606458368: cksum mismatch
Invalid Disk Label @ 8795610652672: cksum mismatch
/dev/disk1s2 is not a CoreStorage volume
Problems were found with the partition map which might prevent booting
Error: Storage system verify or repair failed.

Here is the output of `diskutil coreStorage list`:
>: diskutil coreStorage list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 493EC175-1234-465E-B6F5-324615AD2B94
    =========================================================
    Name:         -none-
    Sequence:     0
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 92E1ADAF-4567-40C6-BA94-4DB39023E3F3
        Index:    0
        Disk:     disk1s2
        Status:   Failed
        Size:     -none-
Not looking good? But I badly need to recover the data on this drive. How can I ever trust Time Machine to backup my files in the future if it corrupts things like this?

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Capacity:          320.07 GB (320,072,933,376 bytes)
Removable Media:          Yes
Detachable Drive:          Yes
BSD Name:          disk3
Product ID:          0x0651
Vendor ID:          0x059f (LaCie)
Version:          0.00
Serial Number:          10000E000CDADC1F
Speed:          Up to 480 Mb/sec
Manufacturer:          LaCie
Location ID:          0xfd100000 / 3
Current Available (mA):          500
Current Required (mA):          2
Partition Map Type:          GPT (GUID Partition Table)
S.M.A.R.T. status:          Not Supported
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