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ATIH 2016 runs needlessly for many hours

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I didn't see this issue addressed after reading 16 of this forum's pages, so I apologize if this is a repeat question.

Acronis, on my Win 7 PC, is behaving properly except for one intermittent and random problem.  Many times, it runs 12+ hours.  My full backups are only around 200 GB and my differentials range from <1GB to 4GB.  No matter which is being run, and no matter which day of the week, Acronis runs and runs, or else finishes quickly.  According to Windows Explorer, full backups tend to normally run for 3-4 hours, while differentials run 1/2-hour to 2 hours.  These marathon overnight runs are unexpected and baffling.

Can anyone explain this, and if so, tell me what to do to troubleshoot/fix it?  I am using a new external hard drive and a clean installation of ATIH 2016.

By the way, this behavior was also in ATIH 2014.  

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Hi fuser.  There could be a lot of factors at play so you'll have to do some trial and error to pinpoint the cause as everyone's setup and hardware is different.

Where are the backups being written to (NAS/network, USB attached drive, etc).

How much space is on the destination drive?  

What type of disks are being used on the destination drive (5200RPM, 7200RPM, hybrid drive, SSD, etc).

Have you tested the health of the drives with chckdsk /f /r (source and destination drives) to ensure the drives don't have any dirty bits?

If using a USB attached drive for backups, is it USB 2.0 or 3.0?  

If using a network attached storage drive, are you connecting wirelessly or via an ethernet cable?  What type of storage device as well (many home NAS devices have limited CPU and memory and may be hampered by limited resources during large backup jobs).

Try lanspeedtest lite with some 1Gbs transfers to your storage medium (works on USB as well as across the network).  Run a few tests and see what your average write times are.  If they are low (only a couple of Mb that will help explain the slowness).

Is your AV set to not scan the destination location?  If it is scanning, AV will check each file in real time as it's being written and can severely hamper performance.

What type of CPU and how much memory does your computer have?  Higher performance systems will be able to process tasks more quickly (say an i5 6700K vs an intel baytrail CPU).

When I run a full backup of a 250GB SSD (80GB used) to another SSD attached directly to the SATA ports on my motherboard - it takes roughly 8 minutes to backup and/or restore.  The same job to my SMB share across the network, attached via USB 3.0 to a 7200RPM drive takes roughly 40 minutes.  Swapping the drive on that remote share with an SSD cuts it down to about 30 minutes.