Backup fails when one of two external hard drives is not connected.

Hi everybody.
On one computer, I want to backup data every day, one day on a "first" external hard drive, one day on a second one.
A specific letter is assigned to each drive, Y for "Drive Y", Z for "Drive Z".
The backup on drive Y is scheduled at 20h00mn every day.
The backup on drive Z is schduled at 20h01mn (necessary ?) every day.
For both backups, the option "do not execute if drive is not attached" is enabled.
The option "Execute the missed backup" is not activated.
The problem is that when drive Y is not attached, the backup on this drive fails, and the backup on drive Z is set to "Queued", until the PC stops with a third backup (at 22h00mn).
The problem is not the same when drive Y is attached because the backup on this drive is scheduled before the one on drive Z.
I ran VSS Doctor, the report is joined.
This type of backup on two different devices is OK on an other PC and with two USB sticks.
Can you please help me ?
Thanks.
Stéphane
Fichier attaché | Taille |
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AcronisVSSDoctorReport_2019-09-17-19-05-28.txt | 8.45 Ko |


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Hi Steve.
One more time, you help me :-)
I will test what you wrote.
But one question :
Using a pre command to test if the drive is attached or not : isn't it what the "do not execute if device is not attached" option should do ?
Best regards.
Stéphane
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Hi Steve again :-)
I've tried your solution, on a PC with Acronis 2019.
It works ;-)
But, I've tried without a pre-command, just with the "Do not show messages ..." option enable.
It works too !
Note that Acronis True Image 2019 does not show the "Do not execute if device is not attached" option, if the device is a hard drive. ATI shows the option if it's an USB stick only.
I will try this setup this evening.
I will tell you if it's works with ATI 2018.
Best regards.
Stéphane
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Hi everybody.
Yesterday, I did some tests on the PC with ATI 2018.
Although the "Repeat attempt if a backup fails" option was desable, each time I ran the backup, the backup made 5 attempts before stopping.
But it was not a problem. The backup on the Z drive started right after.
So today, I rewrote the backup task on drive Y.
I confirm that with ATI 2018, the " "do not execute if device is not attached" option is available even if the device is a hard drive ...
Tomorrow, I'll see if ATI retries the backup on drive Y (the drive will not be attached).
Best regards.
Stéphane
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