Incremental backup not working as expected for external hard drives
I have incremental local back-ups set up for my internal drives (C:\, D:\) and incremental local back-ups for some external drives which don't change often (E:\ and F:\). The incremental works fine for the internal computer back-up - it creates a large initial full back-up, followed by a lot smaller back-up of only what's changed. The "incremental" back-ups of the external drives however seem to back up everything each, regardless of whether they have changed or not.
What's going on? Is this "working as designed"? I'm wasting a lot of back-up disk space!

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Charles, incremental backups should work the same regardless of where the actual source is (Internal or External drives) but other factors may be at work here?
Assuming that you are using ATI 2018 as per this forum, then what file system is being used on your external drive?
The ATI 2018 User Guide: Supported file systems lists those that can be backed up normally as with internal drives.
What I suspect may be happening here is that your external drive is using exFAT for the file system, in which case ATI 2018 uses 'sector-by-sector' method for the backup.
Supported file systems
- FAT16/32
- NTFS
- Ext2/Ext3/Ext4 *
- ReiserFS *
Note: ReiserFS partitions and disks cannot be backed up to Acronis Cloud.
- Linux SWAP *
* The Ext2/Ext3/Ext4, ReiserFS, and Linux SWAP file systems are supported only for disk or partition backup/recovery operations. You cannot use Acronis True Image 2018 for file-level operations with these file systems (file backup, recovery, search, as well as image mounting and file recovering from images). You also cannot perform backups to disks or partitions with these file systems.
If a file system is not supported or is corrupted, Acronis True Image 2018 can copy data using a sector-by-sector approach.
The use of sector-by-sector with an unsupported file system would give the results you are seeing here.
Note: exFAT file systems are supported in the latest version of ATI 2021 and started to be supported from ATI 2019 on.
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