Hi guys,
Encase it helps anyone, I find that SnapManagers visibility of archive is pretty buggy and the following helps me resolve the grey box:
1. Ensure server has TPS settings for both source/dest filer
2. Ensure server is connected via iSCSI to both
3. Remove dest filer TPS, disconnected iSCSI, add TPS back and reconnect iSCSI - restart snapdrive
Keep doing step 3 even without removing TPS just disconnecting the archive filer connection but selecting a different iSCSI interface on the Netapp system and eventually I find the archive box will display under Backup > Backup & Verify but I usually right click the server instance and select Backup Verification Settings as on the 2nd tab for SnapMirror and SnapVault - you can click the verification button and if SMSQL can see the archive destinations they will popup in a dialog after a minute or fail if the issue still persists and if I can get them to display here and with the -archivebackup string in place I find they work nicely.
Thanks