[OnePlus 6T  Guides, News, & Discussion] :
From twrp, if u are rooted and your bootloader is unlocked:

Run each command, it pulls each partition to your internal, then zip em up in a folder and upload to drive, etc..

adb pull /dev/block/sde72 ImageFv.img

adb pull /dev/block/sde20 LOGO_a.img

adb pull /dev/block/sde48 LOGO_b.img

adb pull /dev/block/sde8 abl_a.img

adb pull /dev/block/sde36 abl_b.img

adb pull /dev/block/sde58 aging.img

adb pull /dev/block/sde1 aop_a.img

adb pull /dev/block/sde29 aop_b.img

adb pull /dev/block/sde63 apdp.img

adb pull /dev/block/sde5 bluetooth_a.img

adb pull /dev/block/sde33 bluetooth_b.img

adb pull /dev/block/sde11 boot_a.img

adb pull /dev/block/sde39 boot_b.img

adb pull /dev/block/sdd2 cdt.img

adb pull /dev/block/sde13 cmnlib64_a.img

adb pull /dev/block/sde41 cmnlib64_b.img

adb pull /dev/block/sde12 cmnlib_a.img

adb pull /dev/block/sde40 cmnlib_b.img

adb pull /dev/block/sda12 config.img

adb pull /dev/block/sdd3 ddr.img

adb pull /dev/block/sde14 devcfg_a.img

adb pull /dev/block/sde42 devcfg_b.img

adb pull /dev/block/sde61 devinfo.img

adb pull /dev/block/sde62 dip.img

adb pull /dev/block/sde9 dsp_a.img

adb pull /dev/block/sde37 dsp_b.img

adb pull /dev/block/sde18 dtbo_a.img

adb pull /dev/block/sde46 dtbo_b.img

adb pull /dev/block/sda6 frp.img

adb pull /dev/block/sdf5 fsc.img

adb pull /dev/block/sdf4 fsg.img

adb pull /dev/block/sde21 fw_4j1ed_a.img

adb pull /dev/block/sde49 fw_4j1ed_b.img

adb pull /dev/block/sde22 fw_4u1ea_a.img

adb pull /dev/block/sde50 fw_4u1ea_b.img

adb pull /dev/block/sde23 fw_ufs3_a.img

adb pull /dev/block/sde51 fw_ufs3_b.img

adb pull /dev/block/sde24 fw_ufs4_a.img

adb pull /dev/block/sde52 fw_ufs4_b.img

adb pull /dev/block/sde25 fw_ufs5_a.img

adb pull /dev/block/sde53 fw_ufs5_b.img

adb pull /dev/block/sde26 fw_ufs6_a.img

adb pull /dev/block/sde54 fw_ufs6_b.img

adb pull /dev/block/sde27 fw_ufs7_a.img

adb pull /dev/block/sde55 fw_ufs7_b.img

adb pull /dev/block/sde28 fw_ufs8_a.img

adb pull /dev/block/sde56 fw_ufs8_b.img

adb pull /dev/block/sde3 hyp_a.img

adb pull /dev/block/sde31 hyp_b.img

adb pull /dev/block/sde10 keymaster_a.img

adb pull /dev/block/sde38 keymaster_b.img

adb pull /dev/block/sda5 keystore.img

adb pull /dev/block/sde67 limits.img

adb pull /dev/block/sde71 logdump.img

adb pull /dev/block/sde69 logfs.img

adb pull /dev/block/sde7 mdtp_a.img

adb pull /dev/block/sde35 mdtp_b.img

adb pull /dev/block/sde6 mdtpsecapp_a.img

adb pull /dev/block/sde34 mdtpsecapp_b.img

adb pull /dev/block/sde57 minidump.img

adb pull /dev/block/sda3 misc.img

adb pull /dev/block/sde4 modem_a.img

adb pull /dev/block/sde32 modem_b.img

adb pull /dev/block/sdf2 modemst1.img

adb pull /dev/block/sdf3 modemst2.img

adb pull /dev/block/sde64 msadp.img

adb pull /dev/block/sda15 odm_a.img

adb pull /dev/block/sda16 odm_b.img

adb pull /dev/block/sda8 oem_dycnvbk.img

adb pull /dev/block/sda9 oem_stanvbk.img

adb pull /dev/block/sde59 op1.img

adb pull /dev/block/sda7 op2.img

adb pull /dev/block/sda4 param.img

adb pull /dev/block/sda2 persist.img

adb pull /dev/block/sde15 qupfw_a.img

adb pull /dev/block/sde43 qupfw_b.img

adb pull /dev/block/sda10 reserve1.img

adb pull /dev/block/sda11 reserve2.img

adb pull /dev/block/sde60 sec.img

adb pull /dev/block/sde66 splash.img

adb pull /dev/block/sde65 spunvm.img

adb pull /dev/block/sda1

adb pull /dev/block/sde70 sti.img

adb pull /dev/block/sde19 storsec_a.img

adb pull /dev/block/sde47 storsec_b.img

adb pull /dev/block/sda13 system_a.img

adb pull /dev/block/sda14 system_b.img

adb pull /dev/block/sde68 toolsfv.img

adb pull /dev/block/sde2 tz_a.img

adb pull /dev/block/sde30 tz_b.img

adb pull /dev/block/sda17 userdata.img

adb pull /dev/block/sde17 vbmeta_a.img

adb pull /dev/block/sde45 vbmeta_b.img

adb pull /dev/block/sde16 vendor_a.img

adb pull /dev/block/sde44 vendor_b.img

adb pull /dev/block/sdb1 xbl_a.img

adb pull /dev/block/sdc1 xbl_b.img

adb pull /dev/block/sdb2 xbl_config_a.img

adb pull /dev/block/sdc2 xbl_config_b.img

I think that does it .

Help me out anyone, [MENTION=4204048]Dark Nightmare[/MENTION]. If im missing anything..