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Why is my backup taking so long to run?

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I recently upgraded from Acronis 2010 to 2016. The files I'm backing up are on an external HDD and being backed up to another external HDD. There's approx 18GB of data to backup. It's a full backup. I scheduled a backup task to run at 6AM this morning. It's still running at 1PM...7 hours later. It does still appear to be running because I see the status being updated. If I look at the .tib it's creating, it's 15.7GB right now. 7+ hours to backup 18GB seems way too long...I can copy the files over manually in less time.

I have other backup tasks I want to run with more data...200+GB, etc. By my estimates, that'll take me days to backup given the current backup speed.

This cannot be normal, right?

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