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Opened Little Snitch, filtered by denied connections. There was one particular OS Service that stood out by just looking at the name: 'IMTransferAgent'. This is what LittleSnitch says about that service: “Instant Messaging Transfer Agent” is a macOS system process and responsible for sending and receiving files transferred using the.
Little Snitch 5 and TripMode 3 had no problem blocking the previously-cloaked processes afterwards: though one may well be left with a niggling doubt: should all this really be necessary to monitor your own computer's network traffic? UPDATE 1: Hany, author of Murus and Vallum, was kind enough to reply with some testing of his own.

I'm still on Catalina, and I'm still using both Adguard & Little Snitch in KEXT mode. Both are working fine together; both have always been working fine together. But I see trouble brewing on the horizon.
See here – https://obdev.at/support/littlesnitch – under 'Troubleshooting' > 'Incompatibility of Little Snitch with other software on Big Sur 11.0.1'

Adguard: Programs filtered by Adguard may hang when they try to access the Internet

and

Imtransferagent Little Snitch Game

Various ad blockers: These may defeat the purpose of Little Snitch because they catch Internet traffic and reinject it from their own process. Little Snitch therefore does not see the originating process.

That second quote is the important one, and I tested this on Catalina 10.15.7 with Adguard in NEXT mode, while Little Snitch was still in KEXT mode.
The result is that (probably because it goes for full path URLs, not just domains and IP addresses) Adguard will intercept network connections first, while Little Snitch, being the more 'general' tool, will come second, and then Little Snitch does not know from which app or process a network connection is originating, i.e. Little Snitch will only see the Adguard MITM as the originator. So Little Snitch is inoperable, because Adguard destroys its main functionality.
Judging from the notes by Objective Development, this is also true for Big Sur with both applications running in NEXT mode.
This is an absolute no-go, because Little Snitch is the far more important tool, especially for security purposes. Imtransferagent little snitch girl

Little Snitch Micro Snitch

I know that Apple is probably to blame here, but is there currently any way to undo this fiasco? Maybe a setting in Adguard that will do the trick? Maybe by using the local proxy setting? Or do I have to accept the fact that I paid for an Adguard lifetime family license for nothing? Because if this problem—and it is a HUGE problem—doesn't get fixed, I will have to resort to Adguard's browser extension, and use /etc/hosts for system-wide adblocking.
Any information would be very much appreciated, especially about your plans on how to rectify this issue.

According to ObDev developers, it is crucial for Little Snitch to avoid unnoticed ruleset changes. Little Snitch therefore has numerous mechanisms to detect whether it is using the exact same ruleset file, as in, on the same volume and at the same physical address on that disk. This sort of mechanism makes it impossible for Little Snitch to use the ruleset on the booted backup volume without physical intervention from a user at the system (thus the dialog asking if it's OK to use the current version of rules or to use a default ruleset).

In cases where you have physical access to your computer while booting from the backup, the solution is straightforward — simply click the button to use the current rule set and everything behaves as normal.

In cases where you do not have physical access to the system, e.g. you have a server in a colocation facility, there is a logistical challenge. While Little Snitch is reporting that the ruleset doesn't match, it's also preventing network connectivity to and from the server. If you rely on VNC screen sharing to access the system, you will be unable to access the system to accept the current version of the Little Snitch ruleset.

According to ObDev developers, you can avoid this logistical lockout by removing the following two items from your backup volume before rebooting from it:

/Library/Extensions/LittleSnitch.kext /Library/Little Snitch

Once rebooted, reinstall Little Snitch to regain the application firewall and all is well.

Imtransferagent Little Snitch 2

While that method works fine for cases in which you plan to reboot from the backup volume, you're potentially in a lurch if you have an unplanned incident, e.g. the server's hard drive fails. To avoid encountering this problem altogether, you can exclude those files from your backup task.

CCC does not delete files from the destination that are excluded from the backup task, so be sure to remove those items from your destination if you have already established your backup.