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Incremental backup does full backup even after initial full backup

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I have a 1 TB external drive attached to my Windows 10 mostly consisting of Sound Libraries which do not change, but occasionally get added to. I'm backing it up to another external hard drive using the Incremental method automatically once a week, but rather than doing a full backup followed by a backup of only what has changed since the previous week (normally nothing!), it is trying to back up everything each week, and then failing due to lack of space on the back-up disk. The same technique seems to be working fine for my incremental internal hard drive backup. Is this a known problem, or am I doing something wrong?

Windows 10, Acronis True Image 2018

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Charles, welcome to these public User Forums.

Please open the Options for the problem backup task in the ATI 2018 GUI and check that the Backup Scheme is still configured as an Incremental backup and that all other settings are set as you expect them to be?

There have been problems recently where lots of users have found their task settings reset to the default values shipped by Acronis for the application!