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Cannot open tib files with ATI 2021

Thread needs solution

Hello.

We're very frustrated with this problem. We have installed ATI2021 in our company taking backups from CNCs. We used to have ATI17 (or maybe 15 not sure) which created tib files. 
Now we had to open with ATI2021 a tib file but we cannot. We get error that

An error occured while opening the backup archive (attached two photos from the errors opened from explorer or from ATI shell)

Cannot continue the operation because the backup is corrupted, or it is being used by another process, or you do not have enough permissions to perform this operation. 

Same happens regardless if we try to open from browser or by "Add existing backup" in ATI2021 shell. 

We have several backups in TIB format and all work perfect in old machines with old ATI. No question about being corrupted or missing files. 

We can successfully open TIBX files created with ATI2021

Is there a solution to this problem?

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George, welcome to these public User Forums.

KB 1689: Backup archive compatibility across different product versions has tables for each of the various Acronis products and what earlier versions they are compatible with which suggests that there shouldn't be any problems with opening backups created by ATI 11, 2009 thru' 2020 versions.

Are the problem .tib files exactly as they were created or have they been renamed in any way, and are they complete in terms of any version chains of incremental or differential backups?

If you have systems with older versions of ATI - have you taken the same problem .tib file(s) to those systems and confirmed that they can be opened successfully there?

Get the .iso file for your previous ATI version. Use Rufus to create a bootable flash drive. That should be able to restore the older TIB files to a drive. Then you should be able to access the files. I have iso's back thru version 8 if you can't find one. Acronis had them in their archive folder and they may be able to help.