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Let's see an example when Acronis True Image would not peg the CPU at 100%. Imagine we create a backup from an SSD to a NAS device through an Ethernet cable. Let's say the SSD delivers 70 MB/s read speed, network connection is 1 Gbps and the NAS has an HDD with a real write speed around 35 MB/s. Crucial M550 SSD firmware updates. M500 SSD firmware and support. April 13, 2020 Crucial M500 SSD firmware updates. M4 2.5 inch firmware and support. Acronis True Image for Crucial download. Transfer your existing data for a hassle-free SSD installation on MacOS computers.
BitLocker is a Microsoft technology for encrypting disk volumes. Its main purpose is to prevent unauthorized access to Windows, programs and user data, if hackers try to tamper with computer boot process or get physical access to the disk. BitLocker disk encryption optionally can be coupled with a hardware component Trusted Platform Module (TPM), available on some modern computers, and a USB key, for the highest level of protection.
Sometimes called 'full-disk encryption', BitLocker, however, targets disk volumes individually, such as C:, D:, F: and others. BitLocker is enabled on per - disk volume basis, not for the entire physical disk. In other words, you cannot tell BitLocker to encrypt an HDD or SSD: you can only encrypt a disk volume, which can occupy more or less disk space on the HDD or SSD.
In this article we will use the term 'disk' the way it is used in Windows Explorer user interface: indicating a disk volume, e.g. C:.
Learn more about BitLocker at Microsoft website.
Acronis True Image is compatible with BitLocker with certain limitations that depend on the current status of BitLocker protection of the disk.
Disks can be:
1) encrypted and locked
2) encrypted and unlocked
3) not encrypted
The simplest way to tell BitLocker status of a disk is to see how the disk looks in Windows Explorer.
Encrypted and locked
Disks that are encrypted by BitLocker and are in locked state have a gold lock on them. Such disks are not available for any operation by Acronis True Image, except for being overwritten when recovering an Entire PC, disk or partition backup in disk/partition mode using Acronis Bootable Media.
To unlock the disk, while keeping it encrypted, right-click the disk and select 'Unlock drive..', enter the password and click Unlock:
Encrypted and unlocked
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Disks that are encrypted by BitLocker, and are in unlocked state, have a silver unlocked padlock:
Encrypted and unlocked disks:
- Can be backed up in any mode: Entire PC, disk, partition, files/folders. Backups of type 'Entire PC' will fail, however, if at least one internal disk is encrypted and locked, even if others are unlocked or not encrypted at all.
- Can be cloned, if the cloning operation does not request a computer reboot
- Can be overwritten when recovering an Entire PC, disk or partition backup in disk/partition mode using Acronis Bootable Media
- Are saved in Acronis True Image backup and cloned in unencrypted state. If you recover them or boot from the clone, you will need to turn on BitLocker protection again. For that, right-click the disk and select 'Turn on BitLocker':
- Cannot be read by Acronis bootable environment:
- Cannot be backed up by using Acronis bootable media or Acronis Startup Recovery Manager (F11 key function)
- Disk cloning of such disk will fail, if the cloning tool requests a computer reboot
- Recovery from or to such disk, initiated in Windows, will fail, if a computer reboot is requested
- Encrypted and unlocked disks cannot be read by Acronis Bootable Media
- Avoid storing backups on encrypted and unlocked disks, because at recovery time the bootable media or the bootable agent will not 'see' the disk, where the backup is stored. A relatively safe scenario is when you store file/folder backup on encrypted and unlocked disk, and plan to restore to a new location, not overwriting the original files/folders.
- Cannot be used for activating Acronis Startup Recovery Manager (F11 key function) on them
- Block Acronis Secure Zone creation. To create Acronis Secure Zone, decrypt the disk by turning off Bitlocker.
- Restrict Acronis Try&Decide feature usage, regardless of any planned Try&Decide settings: Try&Decide cannot work when a partition in your system is encrypted with BitLocker.
- Survival Kit creation may require re-formatting the external disk, if it is encrypted with Bitlocker and unlocked
You may see a yellow triangle with an exclamation mark picture overlay and a silver unlocked padlock on the disk - it would indicate that the disk, still being encrypted by BitLocker and in unlocked state, has BitLocker protection suspended. Such disks are treated by Acronis True Image the same way as encrypted and unlocked.
How to turn off BitLocker
To lift the above listed restrictions, you can turn off BitLocker protection, which will decrypt the disk:
- Right-click the disk in question in Windows Explorer and select 'Manage BitLocker':
- Click 'Turn off Bitlocker' on the BitLocker management screen:
- Confirm the operation and wait until the decryption finishes. It may take up to several hours for big disks with a lot of data and programs on them.
- After the operation finishes, the disk becomes not encrypted
If the disk does not bear any padlock adornment, it is not encrypted at all. In other words, BitLocker protection is either not enabled (not to be confused with the term 'suspended'!), or was turned off. Such disks are available for all operations with Acronis True Image without any limitations.
You may notice that CPU usage becomes high when Acronis True Image is running a backup job. CPU's temperature increases and so does the fan noise. Upon checking the list of running processes you discover that the process consuming most of the CPU resources is TrueImageHomeService.exe. After the backup finishes, the CPU usage returns back to normal.
If you had an earlier version of Acronis True Image before, you may recall that CPU usage was not that high during backups.
Higher usage of available CPU resources is part of adjustments, made in 2017 and newer version of the software, to achieve the maximum backup speed possible on a given machine.
Factors of high CPU usage by TrueImageHomeService.exe
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The CPU usage during a backup with Acronis True Image directly depends on the lowest of the two values: the speed at which the backup source data is being read and the speed of your destination disk. When running a backup from a fast source, such as SSD, especially PCIe-connected, to another similar device, your hardware allows data transfer at a very high rate, which means that Acronis True Image has to process much more data per second than it would if the backup was processed over a slow USB or network connection. Faster data processing means that more work needs to be done per second, more CPU resources are consumed, thus the CPU usage is higher. On the other side, creating a backup over a slow USB2 cable or through a 100 Mbps network (12.5 MBps) means that less data has to be processed per second, the backup goes at a slow pace, less computing resources are required for that and the CPU usage is lower subsequently.
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Enabled backup compression and encryption also cause higher CPU utlization, because they require additional operations to be performed by the backup engine, TrueImageHomeService.exe.
Comparison with earlier versions of Acronis True Image
Earlier versions of Acronis True Image did not take the advantage of the full potential of the CPU when running a backup from a fast source to an equally fast destination disk. For example, when your hardware was able to provide 150 MB/s read speed from the backup source and 100 MB/s write speed to the backup destination, theoretically the backup could run at a speed close to 100 MB/s (the lowest of the two values). But as the earlier version of Acronis True Image (2016 or older) was not capable of taking all the available CPU resources, the backup could be running at lower speeds, e.g. 50-60 MB/s., consuming e.g. 40% of CPU. With Acronis True Image 2017 and newer versions, the CPU usage would be 100% and the backup speed would be higher, closer to the potential 100 MB/s limit imposed by the hardware.
Example of when the CPU usage would be low
Let's see an example when Acronis True Image would not peg the CPU at 100%. Imagine we create a backup from an SSD to a NAS device through an Ethernet cable. Let's say the SSD delivers 70 MB/s read speed, network connection is 1 Gbps and the NAS has an HDD with a real write speed around 35 MB/s. In that case the data flow speed would be limited by the NAS's slow HDD and, having a powerful CPU unit, the CPU usage during backup would be rather low, e.g. 30%. Low CPU usage is that case is explained by the small amount of data that Acronis True Image has to process per second (35 MB/s). CPU usage would be low as well, when backup source or destination is a USB2-connected disk.
In other words, the higher backup speed you observe, the more CPU resources you can expect to be consumed during that backup.
'Operation priority' setting
Acronis True Image has a setting called 'Operation priority' under Advanced backup settings. This option does not allow you to lower the CPU usage when it is high. The 'Operation priority' setting is not absolute: low priority does not mean low CPU usage. Winrar macbook pro. It only sets the priority of TrueImageHomeService.exe process relatively to other processes running in Windows. When there are not enough CPU resources for two processes, the process with higher priority takes them.
This article is about consuming the CPU resources by the TrueImageHomeService.exe process only. If you notice that other Acronis processes consistently peg out the CPU at 90-100%, please contact Acronis Customer Central with debug logs and a memory dump of the Acronis process in question, created with ProcDump utility (see https://kb.acronis.com/content/27931, section 6B).