At our job site, we have a Synology Diskstation (DS412+) serving as our backup device. It currently backs up our ESX host and mail server. We also have an external drive backup in place for off-site backups.
There's currently two USB hard drives used to accomplish this off-site backup. One drive is left connected to the device and the backups run in the early morning. The other drive is taken off-site.
This has worked great, but ever since both drives were connected at one time (to recover data), it's become difficult to manage. Now, the drives appear as "usbshare1" and "usbshare2". Before, one drive or the other would be "usbshare1"; now, this doesn't happen so we can't have a single backup job since it'd fail when drive 2 was connected but drive 1 was not.
What do people usually do in this case? I've attempted to alternate days, but this would require changing the backup schedule weekly and I'd like to avoid this.