Soda Posted December 9, 2013 Report Share Posted December 9, 2013 Hi, I've been using a copy script to backup from a NAS(ext4) to an external HD (HFS format). The operation completed and took nearly 9 hours for about 95,000 files. On verification roughly 80 files show a compare error "different data size". Is this to be expected when copying between different filesystems? Would I be better off with a backup script rather than copy, which I only used as I didn't want an incremental backup? Thanks Quote Link to comment Share on other sites More sharing options...
NTmatter Posted December 9, 2013 Report Share Posted December 9, 2013 Can you give some examples of the changed files? It's entirely possible that a bit of Finder metadata (eg, .DS_Store) might have been updated due to regular file browsing activity, or an application was changing some files during the copy/verify process. Quote Link to comment Share on other sites More sharing options...
Lennart_T Posted December 9, 2013 Report Share Posted December 9, 2013 Why are you still using HFS? Or it is just a typing error and you mean HFS+ ? How is the NAS volume mounted? SMB or AFP? I think Ext4 is largely irrelevant here. Did any of the "different" files have a resource fork? Quote Link to comment Share on other sites More sharing options...
Soda Posted December 11, 2013 Author Report Share Posted December 11, 2013 Hi, thanks for the input. I'm using HFS+ and AFP, also the files don't have resource fork. I think it's quite likely it was something that happened in the background since the file size change was quite small, and the the time between copy and compare was quite long. I have since copied them again using a backup script instead of copy and had no discrepancies. Quote Link to comment Share on other sites More sharing options...
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