Also on iOS: Settings > Phone > Silence Unknown Callers

I succeeded in doing this once long ago. Then while in the Linux vm I wiped the VM’s partition table, which wiped the physical disk partition table, including windows. Do not recommend.

I think you should reconsider Proton. It seems to tick all of your boxes except US-based. However, I know they have US-based VPN servers, so I expect they have US-based email servers as well. It’s worth asking their support team about.

Are all of those drives powered up constantly? What’s your power bill like?

Get a BeagleBoard! https://www.beagleboard.org/boards/beaglev-ahead

Edit: or a Star64! https://pine64.com/product-category/star64/

Yes a back up is possible. Don’t back up partitions, back up the whole device. All 150+g at once.

Whenever you try to mount the device or the filesystems, make sure to mount it read-only so that no changes are written to the device.

Also, shrinking 84g of data into 32g is definitely not possible. Just changing the fdisk partition table doesn’t shrink or relocate the data. You need a filesystem-aware resizing tool to shrink the filesystem before shrinking the partition.

Hopefully you can just change the partition table back to the original values and get a clean fsck.