unleashed-firmware/applications/storage/storage_internal_api.c

#include <furi/record.h>
#include <m-string.h>
#include "storage.h"
#include <toolbox/tar/tar_archive.h>

#define INT_PATH "/int"

FS_Error storage_int_backup(Storage* api, const char* dstname) {
    TarArchive* archive = tar_archive_alloc(api);
    bool success = tar_archive_open(archive, dstname, TAR_OPEN_MODE_WRITE) &&
                   tar_archive_add_dir(archive, INT_PATH, "") && tar_archive_finalize(archive);
    tar_archive_free(archive);
    return success ? FSE_OK : FSE_INTERNAL;
}

FS_Error storage_int_restore(Storage* api, const char* srcname) {
    TarArchive* archive = tar_archive_alloc(api);
    bool success = tar_archive_open(archive, srcname, TAR_OPEN_MODE_READ) &&
                   tar_archive_unpack_to(archive, INT_PATH);
    tar_archive_free(archive);
    return success ? FSE_OK : FSE_INTERNAL;
}