6.5 has online compaction which runs every night and full compaction which runs once a week. Is there any specific reason you are running compaction during backup?

If you are using Adobe Managed Services. Check with your CSE for best options regarding sync

I don't believe sightly supports this, you can use js OR java code(Sling Model) to do this: Some steps copied from a similar post: 1. Your class adaptable from SlingHttpServletRequest2 Add the following inject @injectprivate Page currentPage;3: check path contains editor.html currentPage.path.contai...

IMS configs are mapped to a particular AEM instance and cannot be shared amongst instances. You will have to recreate the config on other instaces.

You can compare the encoding configuration on working and non-working instances. See below: 

Thanks Kautuk! Good to be back

Karan is right, This issue is related to core components version. Check [1] for more details: [1] https://github.com/adobe/aem-core-wcm-components/releases 

Please check similar question which is already answered at [1] [1] https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/not-able-to-use-slingrequest-geturl-in-sightly/qaq-p/174736 

Which version of AEM are you using? Can you try with the latest service pack and see if you can still reproduce the issue?

You can also look into Granite show/hide functionality that allows show/hide of content based on properties: https://experienceleague.adobe.com/docs/experience-manager-65/developing/components/hide-conditions.html?lang=en#overview