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TI 2012 overwrites backup file

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When I plug in the external USB drive which holds my backups, sometimes the drive letter is different and the backup listed on the "Backup and recovery" tab indicates the backup cannot be found. When I go into the settings for that backup and change the backup location, first it ignores my input and puts the backup in X:\MyBackups\ (where X: is my new drive letter). When I try again, everything looks correct. The problem is instead of doing an incremental backup using the existing backup, it does a full backup and overwrites the existing file.

What am I doing wrong?

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My guess is this... I suspect your issue is simply Windows assigning different drive letters when the drive is used.

For example if you use a USB drive, a flash drive and an SD card and plug them all in one after the other the allocation just follows suit. First detected might be labelled F, the next G and so on. Reboot with them not present and the one that was say H will now be F if that's the one plugged in first the next time.

If Acronis can't recognise the original incremental file in its original location then I think it will run a new sequence again starting with the full image.

I understand how a drive letter can change.  Thanks. 

>> If Acronis can't recognise the original incremental file in its original location then I think it will run a new sequence again starting with the full image.

I own TI 9, 10, 11, 2011, and now bought 2012 for the Advanced Format support.  I don't recall older versions having this issue.  This seems like a bug, and a dangerous one.

Mooly is probably correct.
Do this:
- plug your backup disk in,
- right click on the computer icon on your desktop,
- choose manage, storage, disk management,
- right click on the USB disk in the bottom right section of the window that appears,
- choose change path and drive letter
- assign a drive letter late in the alphabet (like X:\)

Move the tib files you want to keep to another directory on the same backup disk (to avoid a long file copy) and delete your task in ATI. Create a new task.

From now on, the drive letter shouldn't change everytime you plug your device. If you rotate disks, assign a different drive letter for each disk and create 2 tasks, one for each disk.

Why do I need to move the .tib files? Why can't I just delete the now bogus task and create a new one with the new drive letter?

When you delete the task, the TIB files will be deleted. If you don't want them deleted, move them before deleting the task.