My phone got stuck in a bootloop since yesterday and now I am trying to get out any data/backup I can. After dozens of tries (most of the times it just reboots when I choose to get into recovery from the bootloader), I managed to get to recovery and get the whole sdcard contents with adb pull. I am now trying to get backups of some, if not all, apps.

I tried adb backup -all -apk -f -backup.ab but since my phone has the TWRP recovery, this doesn’t work.

1. Is it ok if I just get a backup of the data partition? Will I able to restore apps from this partition to a new phone (possibly not a Nexus6P). Do encryption/lock settings have a role in this?
2. Is it a good idea to try and flash a factory image, so that I have the factory recovery, and try running the same adb command? I am not even sure I will be able to get into recovery again after that.

I am really afraid to anything at this point, before I know that there is a good chance I’ll have any success. I can get to the bootloader easily, but trying to get into recovery fails most of the times.