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changing backup destination

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I'm currently backing up to a networked drive. For various reasons the letter of the drive has to change every now and then so this means I need to update the destination. It could, for example, start off as S:\\acronis\backup and then have to be changed to R:\\acronis\backup.

I'm using an incremental backup scheme. However whenever I change the destination, it performs a full backup rather than creating the next incremental backup in the chain. Is there anyway I can change this so the default behaviour is to perform an incremental, even if the destination has been changed?

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A task for Incremental or Differential will always begin with a full backup. That is necessary, as that becomes the baseline. When you change location, it's like the task is starting over.

But, you shouldn't edit a task. While it seems as though you should be able to edit, in practice sometimes the task ends up failing so we MVPs recommend that you instead create a new task for the new location.

The drive letter and disk ID are always part of the task script, as Tuttle says, a change of location (drive letter change) will always result in a new full image no matter what the stage the original task is at.

The only possible way around this would be to run a pre image script that somehow aliased the drive letter or temporarily changed the drive letter.

***EDIT****
Grover's reply below, reminded me, it is possible to make your external/network drives always report the same driver letter when attached in Windows. It is also possible if you have assigned your network drive a static IP address, to point the task at an IP address.

Is it possible for the network disk to be reassigned a higher drive letter so the insertion of other devices into the network computer does not force a change of drive letter of the storage disk. In this manner, the backup task could point to drive letter x and the network disk would always be drive X.

Thanks to everyone for their comments. I will see if I can try to keep the drive letter permanent by using a letter near the top of the alphabet.