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How to set up persistent storage on systemrescue

The instructions on the official documentation are, in my oppinion, incomplete, so here you'll find how to correctly set up persistent storage

Partitioning

Persistent storage requires an ext4, xfs or btrfs partition to write to, but the normal installation method does not provide this automatically, manual input is required

You must first use fdisk or any other disk partition tool to shrink the vfat partition to make space for the ext4/xfs/btrfs partition

Here's how to do it with fdisk:

run fdisk /dev/sdX where X is the disk where systemrescue is installed at
delete the main partition with d
create a new partition with n, make it primary with p, number 1 with 1, leave the starting sector as-is and give it at least +2G end sector, make sure you don't remove the vfat signature when offered
change the partition type to "W95 vfat (LBA)" with t and then 0c
make this shrinked partition bootable with a
create another new partition with n, make it primary with p, number 2 with 2 and leave the start and end sectors as offered to make it take up the rest of the drive
write these changes with w

Setting up the filesystem

run mkfs.ext4 /dev/sdX2 where X is the drive number where systemrescue is installed at or the equivalent for xfs or btrfs if you're using those

Setting/changing the label name

You must give this persistent storage a label that you will later reference in a systemmrescue YAML configuration file, you can do it with tune2fs or similar tools

With tune2fs:

run tune2fs -L "YOURLABEL" /dev/sdX2 where X is the drive number where systemrescue is installed at

YAML file changes

You must add the following in the global scope of a .yaml file in systemrescue.d/:

global:
    cow_label=YOURLABEL