For a nandroid backup, you want the defaults - boot, system, and data.ahaha
I'm about to backup on TWRP
I did a Titanium backup and deleted it because the file took up too much space before the nandroid backup (silly me)
Do i need to back up system and data?
Theres 1.5GB in system and 3.7GB in data and i cant really do both i dont have the room
Im planning on transferring the backup to my computer to my computer to save space, should i do one then the other or is only one necessary?
You can choose to compress the backups, I do, it helps a lot.
You can send the backup to the sd card.
You can also get an inexpensive OTG USB cable and send it to a USB stick, it has to be formatted FAT32.
^ If you're short on space and can't upgrade to a larger sd card, that's the way to go.
No problem moving your nandroid backup(s) to your pc.
You want to think in terms of being able to restore or they won't be of value - therefore, you want to make them as the boot-system-data set.
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