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Cloning to External USB Drive

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Can someone please advise if in ATI 2016 I should be able to clone my primary WIN 10 OS drive (internal 128gb SSD) to an external 128gb SSD (USB 3 - enclosure)?

I have tried this from both within windows and from boot media and each time the cloning process stalls at Copying 5 of 7?

It appears that both the recovery and EFI partitions are copied, but stalls when trying to copy the main partition.

There are no error messages.

Any ideas?

Acronis chat - suggest that Acronis products will not allow you to clone to external drives!

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D R, welcome to these user forums.

Please see post: 128231: [IMPORTANT] CLONING - How NOT to do this!!! which covers a lot of points regarding cloning.

Backup & Restore is a far safer option for the scenario that you are describing, but I would recommend ensuring that there are no filesystem  issues with either of the drives involved, and also that any external USB drives have good power provision, i.e. that your USB 3 enclosure has its own power supply or is connected to a powered USB 3 hub, and that all the cables used are good.

When doing this type of operation, any logs have to be accessed before the system is rebooted out of the Acronis environment, i.e. using Rescue Media use the Logs function from that media to check for what messages are given.

Not all drives have the same amount of free space on them... one manufacturer 128Gb drive may have 115Gb usable, another may have 100Gb usable.  If the drive is pretty full, it may not actually have enough space to transfer. Others get hung up with bad sectors on one disk (usually the source).  Before cloning, running chkdsk /f /r on the main OS drive may help identify an issue that is causing the drive to not clone - this is where the size of drives can really be an issue as bad sectors will force the backup into sector-by-sector so if the old drive is slightly larger (usable space), it will need all the same space on the new drive.

As Steve mentioned though, you can probably get around all this with a backup and restore.  It's actually more reliable, but you need a third disk to house the backup.  The good thing though, is that you have an actual backup in case things go bad.  You can always restore from a backup.  A clone is on the fly and leaves you no safety net if things go south for any reason. 

Really can't say if USB ports, cables, power or selective supsend may be causing you an issue.  Highly recommend only trying any recovery like this from your rescue media and not starting from Windows - as per Steve's link above:   128231: [IMPORTANT] CLONING - How NOT to do this!!!