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Is it safe/trustworhy to create entire pc backup from windows?

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It takes 15 hours. I will still do things like browse internet, download a couple of files, watch a movie.
Won't this alter the data that is actually being backed up?

Will it be safer in rescue mode? Or it won't matter?
I can't in rescue mode atm. cuz my 5TB HDD isn't detected.

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Yes, it is safe. No, using the PC will not alter the backup data. Some of the other MVPs can explain it better than I can, but essentially ATI takes a "snapshot" at a point in time. Using the PC as the backup progresses does not alter that snapshot.

Ok. Even if u were to install new apps?
It snapshots the entire registry?
Isn't it like there are files in use when running windows, that cannot be read/copied?
Or apps whose files change during this backup... I find it hard to believe it is storing a snapshot of 1.3 TB without additional space?
Good to know it is trustworthy.

Is there a way to test the backup without actually installing it on a pc?

If I were to restore to dissimiliair hardware, I would restore image, then boot acronis universal restore, run procedures, then reboot and voila?
32 bit universal restore works for 64 bit OS?

Reconhell wrote:
Ok. Even if u were to install new apps?

Yes.

It snapshots the entire registry?

Not the registry. The sector information combined with the NTFS volume information.

Isn't it like there are files in use when running windows, that cannot be read/copied?

No

Or apps whose files change during this backup... I find it hard to believe it is storing a snapshot of 1.3 TB without additional space?

When the backup starts, the drive intercepts the changes to the disk, and apply them once the impacted sectors are backed up.

Good to know it is trustworthy.

Is there a way to test the backup without actually installing it on a pc?

You can download or create a bootable recovery medium (CD or USB)

If I were to restore to dissimiliair hardware, I would restore image, then boot acronis universal restore, run procedures, then reboot and voila?
32 bit universal restore works for 64 bit OS?

Follow the universal restore instructions. Yes, it supports 64bit OS as well. The process is "just" slipstreaming drivers during the restore process.

Thanks for the informative reply.

Only thing unclear is when u say download/create bootable medium.
How does this allow me to test my backup? without actually installing the backup file I just made?

What I mean to say is, How will I know the integrity of the backup? Only way is to try it?
Because this is a master backup including many settings and 400 pc games, I can't afford to "just" try it.
I wish to know 100% sure if the backup is good-bootable/restorable I will have made in approx. 5 hours from now.

There is no way to test the integrity of the backup. In the past, you could mount an image and run some comparison software, but there is no way out of the box.

What I meant by testing the backup is to boot the computer on the recovery medium and recover a couple of files from the backup. This ensures that you can run a real recovery when needed.