Full Backups of 2 disks almost identical size?
I have two internal SSD 1 TB drives. Drive C has my OS and program files only with 101.5 GB used out of 952 GB available. Drive S has my userfiles (user created files) only with 659.6 GB used out of 952 GB available.
I did 3 backups to my 5 TB Seagate Backup Plus USB Drive, using ATI 2020 - as follows: 1) "Entire PC" - supposed to be all data & files on both disks; 2) "C Drive (OS)" - supposed to be all/only the OS and program files on the C Drive, and; "D Drive (Userfiles)" - supposed to be all/only the userfiles on the D Drive.
When I look at the backup file sizes of the 3 full backups on the 5 TB Seagate drive I see the following:
#1 Backup (Entire PC) has a file size of 571,286,560 KB
#2 Backup (C Drive) has a file size of 571,575,256 KB
#3 Backup (D Drive) has a file size of 571,593,524 KB
How can such radically different amount of data (101.5 gigs, 659.6 gigs and 761.1 gigs (101.5 + 659.6) be virtually the same sized backup files?


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Lee, if all your backup files are effectively the same size, then to me, it suggests that they are all using the same source selection, i.e. all using Entire PC (or selecting all disk drives).
I would suggest keeping the initial 'Entire PC' backup task, then deleting the other 2 tasks and start again with the other tasks, one at a time.
Click through the Source panel that shows Entire PC, to see the further options and then click on Disks & Partitions which will then show all the installed disks in your PC where you are likely to see all are selected by default. Deselect one drive at the top disk level for that drive so that all partitions below that level are deselected, leaving only one selected.
Continue with clicking on the Destination panel and selecting your 5 TB Seagate Backup Plus USB Drive, then click on Options to set your required Scheduling, Backup Scheme, Notifications and Exclusions settings. Finally, click on one of the Backup now options, i.e. now, in an hour, later..
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