Error when sync or when 'Transfer purchases from iPhone-Name'

We are backing up our iPhone 6 plus and wanted to assure that also the apps were backed up so beside "sync" we also did a File >> Device >> Transfer purchases from iPhone-Name'.

However, we keep getting this error:
Attempting to copy to the disk "XXXXX" faild.  An unknown error occurred (54)

We google it and recommended to restart PC.

We did and same error

After click OK, the sync icon keeps turning as if syncing (if we click on it's X, it says canceling sync).

Should we worry about this error?

Can we complete the backup or sync or the error prevent from a correct backup?

What should we do?
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Shabbir RaoCommented:
First of all I would advice you not to worry. It will get resolve automatically.

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janaAuthor Commented:
Ok just woke up and the phone has been updated (all icons are in gray or non-use form, like it's being downloaded).

Ok will wait to see.
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