Dependency failed for Cryptography Setup for external hard drive

[mphelpsmd]

I have two removable hard drives that I rotate in and out of the system. They are used for backups and one is off-site while the other is connected and receiving backups.

They both use LUKS for encryption.

Every hour, however, I see entries in the system logs that seem to complain about the drive that is not currently connected:

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Mar  3 08:59:18 ares systemd[1]: dev-disk-by\x2duuid-75fe58ba\x2d61a8\x2d4895\x2d8b13\x2d6036da079b00.device: Job dev-disk-by\x2duuid-75fe58ba\x2d61a8\x2d4895\x2d8b13\x2d6036da079b00.device/start timed out.
Mar  3 08:59:18 ares systemd[1]: Timed out waiting for device dev-disk-by\x2duuid-75fe58ba\x2d61a8\x2d4895\x2d8b13\x2d6036da079b00.device.
Mar  3 08:59:18 ares systemd[1]: Dependency failed for Cryptography Setup for encrypted-rotating-backup-2.
Mar  3 08:59:18 ares systemd[1]: systemd-cryptsetup@encrypted\x2drotating\x2dbackup\x2d2.service: Job systemd-cryptsetup@encrypted\x2drotating\x2dbackup\x2d2.service/start failed with result 'dependency'.
Mar  3 08:59:18 ares systemd[1]: dev-disk-by\x2duuid-75fe58ba\x2d61a8\x2d4895\x2d8b13\x2d6036da079b00.device: Job dev-disk-by\x2duuid-75fe58ba\x2d61a8\x2d4895\x2d8b13\x2d6036da079b00.device/start failed with result 'timeout'.

Here is the contents of /etc/crypttab:

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[root@ares ~]# cat /etc/crypttab
encrypted-rotating-backup-1 UUID=13a10cc0-0315-4351-8254-4902ba664cc3 /root/encryption_key luks
encrypted-rotating-backup-2 UUID=75fe58ba-61a8-4895-8b13-6036da079b00 /root/encryption_key luks

And the relevant portions of /etc/fstab:
[root@ares ~]# cat /etc/fstab

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#
# /etc/fstab
# Created by anaconda on Sat Feb 22 14:36:35 2020
# <OTHER NON-RELEVANT ENTRIES REMOVED FOR SIMPLICITY>

# Removable drives with server backups
/dev/mapper/encrypted-rotating-backup-1	/backups/local/encrypted_rotating_backup_1	xfs	noauto,nofail,noatime,rw,user 0 2
/dev/mapper/encrypted-rotating-backup-2	/backups/local/encrypted_rotating_backup_2	xfs	noauto,nofail,noatime,rw,user 0 2

I'm using the nofail attribute in the fstab entries, so I wouldn't imagine that I would get a warning about the drive not being connected. Indeed, the messages seem to be coming from the encryption system.

Is there any way to suppress these warnings, as having one of the drives disconnected does not represent an abnormal event?

Thanks,

Mike