Database Info

Files Safe to remove from SD Card

I have so much Junk on the SD card after rooting the phone. Now I know some folders that I must keep, but there's just so much Junk. Can someone tell me what to keep and what to delete.
I had to divide it into 3 Parts:
Part 1:
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Part 2:
Part 3:

Sixteen petabyte MicroSD card

This is my myTouch in a brand new install of Windows 8 on my spare-parts computer, don't know what's going on here.
Sixteen petabytes of free space. I know it's a brand new SD card, but what is going on here? This image is not edited except for the crop of the window.
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the backup issue

i have a question, can i change the backup location of xperia companion?
second question, before i backup,my phone still have about 10-20 gb storage while back up i notice my pc not have enough space on c drive,so i cancel it,then just backup some data,and the phone show me about 10 gb storage used already, wt happens?
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[Android Pie] System data taking up huge storage room

Is it normal? Can I clean it up?
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bump

Honestly depends on the phone you have. My system memory for galaxy s8+ is 10.7 gb and i'm running android oreo. Nothing you can really do here unless you flash a custom system image which can cause your device to be unstable

Dual sim and sdcard at once - possible?

Maybe someone know about support Dual sim and sd card at once
I have U12+ and Exodus 1 but i need more space than regular 128GB
mod looks easy but if software don't allow to do I dont want risks with broken slot
connector looks ok
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cheers