Different file size for same backup?

Larry, for any 'Entire PC' full backup there will always be some variation in size depending on activity on the system at the time of backup which could account for the smaller changes in actual file sizes for the three files shown in your images.

For the two files for the WD cloud backup files, then there is a 5 hour time difference between when those two files were created / updated which suggests that the backup task has run twice at those times, and the file suffices -0001 & -0002 support this as for how Acronis numbers such subsequent files.

Backup file naming

With .tibx files, the file name has only the backup name and an incremental counter. It does not contain any additional information such as backup method, backup chain number, backup version number, or volume number, which were used with the TIB format.

A backup name may look like:

1. my_archive.tibx
2. my_archive_0001.tibx
3. my_archive_0002.tibx
4. my_archive_0003.tibx

I can understand slight file differences, but after first backup PC was shut down and next morning I ran backup again and made no changes, no work, etc. But about 800,000,000 differences?

2nd 800... + 765... = 1.5TB
1st  800,...

So where did the additional data come from?  My weekly backups over the past several months have always been about 1.5TB.

Larry, sorry but only you will be able to try to determine why there are any size differences in your backup data, i.e. mount the backup image to a Windows drive letter then use a tool such as TreeSize Free to look at the sizes of the content and compare this against a second mounted backup image?

My mistake from above this was 2 backups I did and not 1

2nd 800... + 765... = 1.5TB

Another issue, when I FULL backup to EXT SSD HD(2TB HD) I get over 200 single files and not 1 backup file. I tried 3 times and same results. I only get 1 backup when doing the same backup to non-SSD EXT HD Same settings for FULL. I tried to upload photos(43KB and  149KB)but failed.

error- The file could not be uploaded.

Larry, instead of using the File Upload option, click on the Imce File Manager icon (inbetween the horseshoe and YouTube icons) and select your files with that tool which will embed them in with your reply text.

The reason for multiple single files instead of 1 large file is normally the file system in use on the storage drive which can impose maximum file size limits, or if using FTP for the connection.

I got the photos listed in imce FM, but can't figure out how to get included in posting. Have link to directions??

Larry, all that is needed with Imce is to be in the main text edit window then open Imce and Select the image(s) you want to be embedded with the text you are posting.

Lets try this again... Never got the upload progress bar yesterday

Another issue, when I FULL backup to EXT SSD HD(2TB HD) I get over 200 single files and not 1 backup file. I tried 3 times and same results. I only get 1 backup when doing the same backup to non-SSD EXT HD Same settings for FULL.

All the 4GB individual files in your image says that the storage drive is formatted as FAT32 which imposes that file size maximum.  If you want larger files then you need to use either NTFS or exFAT for the file system.

Thanks

I did research NTFS or exFAT and not sure which I should use. My new WD USB EXT 8TB is exFAT, Win11 doesn't offer exFAT only NTFS. So what's advantage over exFAT over NTFS? How can I format exFAT if I go that way?

Again... thanks for the education...

Larry, if you choose the Format option from Explorer then it doesn't offer exFAT as an option but if you use the Windows Disk Management tool, that does offer that option.

The alternative method is to use a partition tool such as MiniTool Partition Wizard to do the format.

And what I have learned today:

Format 2TB EXT SSD as NTFS default is 4096
What would be ideal or standard to set allocation file size for exFAT on 2TB drive

exFAT not sure what I should set it to, my new 8TB EXT has 1024 from WD.

Also noticed when I make the 2TB drive as rescue media and then I could backup to it, rescue media tool reformats as FAT32 from NTFS. Just thought It would convenient to boot and recover from one HD? So I'll just create rescue media on USB stick to boot

Larry, I have only used NTFS for my own drives other than perhaps doing some testing where exFAT was involved.  As to default allocation sizes, that is outside of my expertise and from recollection there are plus and minus points for both large and small sizes, so perhaps best for you to do some further research on that aspect and decide for yourself.