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Validation very slow in TI 2020 - no support from Acronis available

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What are the most likely causes of validation being very slow in the following context: Plenty of room on external hard drive, blue high speed connections all the way to 2 year old PC on Windows 11, rough 65 GB backup. Acronis apparently does not support 2020 now, and I am looking for alternatives after 13 years using Acronis.

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Tommy, there are known issues with slow validation with ATI 2020 that Acronis started to address in ATI 2021.  One of those issues is that ATI 2020 will want to validate all available backup version chains which can make it run for a very long time!

See forum topic: Reflecting on a Post-ATI World for a discussion on alternatives to Acronis.

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Dear Tommy,
Long validation times are likely caused by the change in the archive format (from .tib to .tibx). One of the main changes in this new backup format is that the .tibx format saves full and differential backup versions as separate files, while incremental backup versions are automatically merged into their base full backups. See Incremental backups do not create separate files when using new backup format for more information: Acronis True Image 2020: Incremental backups do not create separate files when using new backup format | Knowledge Base

Thus validation might take more time for the archives with lots of incremental backups in the chain as compared to the old format.

However, if you observe enormously huge decrease in the performance, we would recommend installing a trial version of the latest build of the product (you can learn more here: Acronis Cyber Protect Home Office (Windows): how to update to the latest build | Knowledge Baseand if the issue reproduces, contacting Acronis support for investigation: https://www.acronis.com/support/