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Very long restoration

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Hello
Following a crash of my PC I am obliged to restore my data disk also
Each directory on this disk has a separate backup
Is it normal for a backup of more than 250 GB to take more than 24 hours to restore?
Thanks for your help
Louis Joly

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Louis, welcome to these public User Forums.

24+ hours to restore over 250GB does sound like a very long time but it depends on a number of factors?

When your PC crashed, what was the cause of this (if known)?

Was your internal disk drives corrupted or damaged in any way?

How many actual drives do you have in the PC?

Did your disk drives get reformatted after the crash?
Did you run CHKDSK /F for the disk drives?

Where are the data backups stored / being restored from?
What type of storage drive and how is this connected to the PC?
If a USB external drive, what USB type?  i.e. is it USB 2.0 or USB 3.0?
What type of USB port is the drive connected to?  USB 2.0 or USB 3.0?

What type of data is stored in the individual directories?
How many files are stored per directory?
What size of files?

The reason for all the above questions is that restoring 1000's of small files can take much longer than restoring a smaller number of large files.
Some files are already highly compressed, i.e. music, images, videos so there would be very little time savings for decompressing these types of files.
USB 2.0 devices are significantly slower than USB 3.0 for transferring data.
If files are being restored over a network connection, then that again can give slower transfers.

Thank you for that answer
SATA 6 internal data disk: formatted before restoration
Disk that contains backups: USB 3
Many small files, a few thousand
Louis Joly

Louis, thank you for the answers.  Not sure that I can tell you any more other than to continue with your recovery of your directories.

Restorations work (that's the main thing) but they are long
The remaining time displayed is completely wacky
Thank you
Louis

File/folder restores are typically slower than disk or partitions restores. They take longer when restoring in Windows and/or to the original location where other files and folder structures are in place. The deeper folders and files are nested, along with the number of files and file sizes, the slower it will be too. This is typically Windows behavior and ability to write based on hardware limits. Manufacturers post random specs, but the speeds that make the difference are the 4K sequential read/write speeds as they give a much better representation of this exact type of restore.

Louis, the comments from Rob (Bobbo) would still apply when using boot media and perhaps be a little slower because of not having the same caching / paging features that Windows can offer.