What version of Duplicati? I am unable to reproduce this on 2.0.6.1 or 2.0.5.114. The alternate-destination-marker and alternate-target-paths settings persist for me.

Please provide steps to reproduce the issue so that we can try and isolate the problem.

I'm using 2.0.6.1. Ok, I will do further testing and post the results here.

Small gui bug, doesn’t remember some advanced settings describes this on Destination screen 2. Options screen 5 keeps it.
I'm seeing this on 2.0.5.114, but not actually testing to see if the invisible (except on GUI Commandline) option actually works...

Thanks for the clarification @ts678. Given the lack of details, I was only checking screen 5.

I can't say this is what @Hoffenbar saw, but it might be. I'm having problems with all screen 2 options for local folder destination.

This issue has been mentioned on Duplicati. There might be relevant details there:

https://forum.duplicati.com/t/solved-losting-advanced-options-when-the-backup-job-is-changed/13478/7

Some further testing details.

1. Any "advanced options" set in Step 2 (http or local) either by list or text entry are lost upon save via initial job creation or via editing the job post creation. Interestingly, any "advanced options" specified are used if you "Test Connection" but are lost after that. For example, if you add an --alternate-destination-marker and if the marker is missing the test errors out on it.
2. On initial job creation the "advanced options" for "Local folder or drive" shown in Step 2 are not available in Step 5 but are shown when editing the job post creation. Also seems strange that the "Configure http requests" options (also shown in Step 2) are available in Step 5 but the "Local folder or drive" options are not.

I'll dig into this later but maybe it will tweak something in someone who knows the code base a bit better than I do.

Still happening in 2.0.6.102_canary_2022-04-06

This issue has been mentioned on Duplicati. There might be relevant details there:

https://forum.duplicati.com/t/had-high-hopes-but-wound-up-uninstalling/14409/26

This issue has been mentioned on Duplicati. There might be relevant details there:

https://forum.duplicati.com/t/backup-task-not-creating-new-log-showing-old-errors/14613/10

Quick workaround: Create the job without any advanced options, save it, reopen then add the advanced options you want in step 5, they will now save as expected.

The difference between the advanced options on step 2 and step 5 is that step 2 encodes them in the target URI.
I can reproduce this bug only for file targets, because the regex used to parse options from the URI cannot handle the backslashes and the colon after the drive letter.

It seems that using backslash paths in a file:// URI is non-standard, so it would be ideal to convert these to correct URIs using slashes in the long run (this might also fix @ character issues).

For now though I can try to see if this monstrosity
/([^:]+)\:\/\/(?:(?:([^\:]+)(?:\:?:([^@]*))?\@))?(?:([^\/\?\:]*)(?:\:(\d+))?)(?:\/([^\?]*))?(?:\?(.+))?/
can be reworked to allow file paths (or maybe I will just add a second one specifically for that).

This issue has been mentioned on Duplicati. There might be relevant details there:

https://forum.duplicati.com/t/advice-about-backend-options-in-tab-5/17279/10

This issue has been mentioned on Duplicati. There might be relevant details there:

https://forum.duplicati.com/t/small-gui-bug-doesnt-remember-some-advanced-settings/9059/8