TWRP for Fairphone 3

[AnotherElk]

@samdaskod

so basically i use twrp on my pc for the smartphone and i can back up everything like that?

Not quite.
You connect your phone to your PC via USB, boot the phone into Fastboot Mode, and then you execute fastboot boot twrp.img (or whatever the filename is) in a command line on the PC.
This will then boot TWRP on the phone without you having to install it. Nothing will change on the phone, as long as you keep System read-only in TWRP (important!) …

@k4y0z

Make sure you have the option “Mount system partition read-only” checked in TWRP if you want to be able to OTA.

You can then use TWRP on the phone to backup the partitions …

@k4y0z

You should generally use the respective “Image” for every partition that gives you that option.
Image will create a direct one-to-one copy of the underlying block-device.
TWRP typically doesn’t include backup-options for all possible partitions.
I have included the ones that are most likely to be modified when the device is rooted.
I have also included some partitions that contain device-specific information such as IMEI (EFS).
It is probably a good idea to backup EFS once and store it somewhere safe, but you typically should not restore it every time.
For a normal ROM Backup/Restore cycle the following partitions should suffice:

• Boot
• System Image
• Vendor Image
• Data

Here’s a little something in case you’re interested …

Used to the Fairphone 2? Don't do these Fairphone 2 things on the Fairphone 3!

It’s not uncommon that users switch over from the Fairphone 2 to the Fairphone 3. The Fairphone 3 got some things which resemble things many users know how to deal with on the Fairphone 2, examples: TWRP is available. Installing a stock version of Fairphone OS is possible (Fairphone way / community way). Custom ROMs are available, e.g. /e/, LineageOS or GSIs. The Fairphone 3 is different from the Fairphone 2, however, and so not every prior knowledge carries over well to the new device. He…