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Why is True Image 2020 creating multiple tibx files

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Acronis used to create two tibx files, which was normal. For the past couple of months it is creating multiple tibx files:

-rw-r-xr-- 1 user group 12K Nov 20  2019 COMMONW10.tibx  
-rw-r--r-- 1 user group 49G Jun 16 19:44 COMMONW10-0132.tibx  
-rw-r--r-- 1 user group 48G Jun 22 19:48 COMMONW10-0133.tibx  
-rw-r--r-- 1 user group 43G Jun 28 19:43 COMMONW10-0134.tibx  
-rw-r--r-- 1 user group 46G Jul  9 19:55 COMMONW10-0135.tibx  
-rw-r--r-- 1 user group 48G Jul 15 20:10 COMMONW10-0136.tibx  
-rw-r--r-- 1 user group 47G Jul 21 20:00 COMMONW10-0137.tibx  
-rw-r-xr-- 1 user group 45G Jul 26 19:38 COMMONW10-0138.tibx

 

The first one from Nov 20 2019 is the normal "initial" file. Each of the others are as big as a full backup of the system. The backup scheme is Daily 7:30P, create a full version after every 5 incremental versions, keep 1 chain.

This problem uses up a lot of disk space. Why is this happening?  How do I fix it?

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-rw-r-xr-- 1 user group 12K Nov 20  2019 COMMONW10.tibx  
-rw-r--r-- 1 user group 49G Jun 16 19:44 COMMONW10-0132.tibx  
-rw-r--r-- 1 user group 48G Jun 22 19:48 COMMONW10-0133.tibx  
-rw-r--r-- 1 user group 43G Jun 28 19:43 COMMONW10-0134.tibx  
-rw-r--r-- 1 user group 46G Jul  9 19:55 COMMONW10-0135.tibx  
-rw-r--r-- 1 user group 48G Jul 15 20:10 COMMONW10-0136.tibx  
-rw-r--r-- 1 user group 47G Jul 21 20:00 COMMONW10-0137.tibx  
-rw-r-xr-- 1 user group 45G Jul 26 19:38 COMMONW10-0138.tibx

The file names are correct for an ongoing backup task.

The first file size 12KB is very important and contains metadata to link together all the components of the backup, including the internal database etc.

As each new version chain is created, an incrementing numeric suffix is applied to the file name, i.e. -0132, etc.

I can only suggest checking your task settings, in particular the automatic cleanup rules as the list of files suggests you are keeping 7 version chains rather than only 1 chain!

Incremental versions are automatically consolidated within the same larger file as the original full backup for that chain.

You are exactly right. I've checked the settings and they were set to keep 10 chains. It was set like this on 4 of the office computers. Something must have changed that since it was set to 1 chain for a very long time (since 2020, in fact). Perhaps an upgrade did something. I noticed this recently, hence my post. Some other settings were also different like the error retry setting. Also, the 'automatic cleanup' was turned off. I've changed these all back to 1 chain.