Google arts & culture?
Project by Google focused on learning about art pieces
Play Store version is paid but comes with additional features including network library integrations
No general reader abilities are behind a paywall though. So fdroid(free) version is recomended
Note, i am kinda a noob but,
Universal Android debloater is a pretty safe tool to use if in recommended option. So I don't think there is a need for a backup. However since UAD uses adb to disable things if your os breaks, you can restore the last disabled packages via fastboot.
For backups, can't twrp backups be copied via USB? If your phone is famous enough you can find stock images on its site or on XDA developer website.
Lastly try this: QFIL tool (video for my phone but steps should be the same for backing up: https://www.youtube.com/watch?v=G9LoaPrbGx0&list=WL&index=62)
However, do note that QFIL tool is a very powerful tool and it's very easy to softbrick the device if you don't know what you are doing. Find a video for your device to be double sure.
Try atlas os dor windows 11 but I would recommend windows 10 ltsc Iot edition. Unlock it using MAS AIO. And you are good to go. Minimal installation without needless simplification of windows 11. It also will obtain windows 10 support longer(research that).