AZ Pete via PLUG-discuss wrote:
However, currently I have to manually mount each of the external
drives. This isn't a terribly big issue since the drives are
rotated to offsite storage only once per month. But, if the Pi
gets rebooted, the drives are not being auto-mounted and the
backups will then fail.

Backup script should check whether the disks are mounted or not? But read on.

/etc/fstab to auto-mount them at boot, but if they drives are
not connected at boot time, I've found the the Pi doesn't boot
(it just seems to hang). 

If a thing may not be there, it is not recommended to auto-mount it on boot.

mount -t ntfs PARTUUID=c6040663-9321-4d28-91f0-2f3eb35f72b7 /mnt/Ext3TB_Data1/

I thought you had to use NTFS-3g to write to NTFS. Also, don't these things have labels? It's much more readable and simpler to mount a thing with a label than a UUID if you can.

How can I "conditionally" mount an external drive based on if
the drive is currently connected?
On 2020-09-09 14:13, James Mcphee via PLUG-discuss wrote:
autofs or udev rules would be your best bet.

https://wiki.archlinux.org/index.php/Udev#Mounting_drives_in_rules explains how to do this sort of thing using udev and systemd (yeck!). udev is not really meant for starting a long-running process, so there is a workaround.

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