[General Questions and Answers] Nazo:
Yeah, NeoBackup lets you set a large number of backups. I think the maximum setting was 9? I think it defaults to 2 though.

As far as I can determine, attempting to restore data even for really old (even Android 4.x era which predate all the major changes from 5+) apps results in a crash on attempting to start said app when using TitaniumBackup with newer systems. As far as I can determine, its data restore methods simply just don't work anymore. It's not really the app that's the problem but the system you're running it on. Restoring data with TitaniumBackup for the same app on a much older Android OS version works fine, just not on the newer one. This is probably not a coincidence -- they made some pretty big changes with Android 10 in particular and then 11 and 13 also made some large changes. (A bunch of stuff that actually legitimately enhances security and privacy, so I can't really complain too much, but it was sad seeing TitaniumBackup die.) Based on the issues we've been hearing about with people getting locked out from accessing some of their data, I suspect 14 makes similarly large security enhancements. Unfortunately, in this era of apps showing up frequently that phone home with all sorts of personal information (some of which are major well known and trusted things like Facebook and X) where people are discouraged from not allowing them (FB apps even fuss and refuse to work right if you deny some permissions they should not be using,) more and more protections seem to be needed.

BTW it seems there may be another option in LineageOS (maybe stock Android/AOSP?) The "SeedStore" (Settings->System->Backup) seems to work kind of like the cloud backup through Google except no Google and no cloud (stored locally.) This doesn't keep multiple backups though and I'm not sure if there is any way to restore anything from a previous seedstore if you don't set it up to use it when you first setup the system though, so I don't consider this a true replacement for NeoBackup or SwiftBackup on its own, but it does at least offer another alternative. It's also kind of annoying in that its password system uses an ultra-high security mechanism in that it has you write down 12 words that it generates randomly itself (maximum entropy, would take a century to guess the key on current gen hardware probably) so you're kind of screwed if you lose it, but I guess that makes sense from an official perspective given that people may have banking or other super important apps encrypted in there. It at least has some advantages like being more inherent to the OS itself and more officially supported as an official mechanism. I don't know how long seedstore has been in there -- I missed it all this time and it basically does nothing to encourage you to use it -- but if you go into backup and set it to use that instead of a cloud backup option you can back it up and then use it to restore things next time you install or to restore data from deleted apps (which can be automatic like the cloud backup) or etc. I see it on both my Android 11 and 13 LineageOS devices, but not sure about anything further back than that. It kind of sucks that there doesn't seem to be any easy way to import seedstore files after initial system configuration though. I guess that too is a security feature or something. Not sure.

Not recommended as a true replacement for the functionality of these others, but an option worth looking into in general. I plan to use it to complement them. Mostly NeoBackup for external backups I have more control of, then SeedStore for restoring a system after a clean install or data from deleted apps, etc with less to actually deal with and more official support.