diff --git a/config.yml b/config.yml
index 3c540f2..d1c632f 100644
--- a/config.yml
+++ b/config.yml
@@ -2,6 +2,7 @@ default:
   data_prep_outputs_path: ""  # a single, absolute or relative path to a directory where the outputs will be saved
   asset_impact_data_path: ""  # a single, absolute or relative path to a directory that contains the AI inputs (can be the same as `factset_data_path`)
   factset_data_path: ""  # a single, absolute or relative path to a directory that contains the FactSet inputs (can be the same as `asset_impact_data_path`)
+  preflight_data_path: ""  # a single, absolute or relative path to a directory that contains a previous "currencies.rds" file and/or will be used to save a copy of pre-flight data files generated on-the-fly (by default [""], this is set the same path as `data_prep_outputs_path`)
   masterdata_ownership_filename: ""  # a single filename of the intended masterdata_ownership CSV (must exist in the `asset_impact_data_path` directory)
   masterdata_debt_filename: ""  # a single filename of the intended masterdata_debt CSV (must exist in the `asset_impact_data_path` directory)
   ar_company_id__factset_entity_id_filename: ""  # a single filename of the intended ar_company_id__factset_entity_id CSV (must exist in the `asset_impact_data_path` directory)
diff --git a/run_pacta_data_preparation.R b/run_pacta_data_preparation.R
index bce53d1..90b8a28 100644
--- a/run_pacta_data_preparation.R
+++ b/run_pacta_data_preparation.R
@@ -96,9 +96,16 @@ factset_manual_pacta_sector_override_path <-
 
 # pre-flight filepaths ---------------------------------------------------------
 
+preflight_data_path <- config$preflight_data_path
+if (preflight_data_path == "") {
+  preflight_data_path <- data_prep_outputs_path
+}
+
+currencies_preflight_data_path <- file.path(preflight_data_path, "currencies.rds")
 currencies_data_path <- file.path(data_prep_outputs_path, "currencies.rds")
 index_regions_data_path <- file.path(data_prep_outputs_path, "index_regions.rds")
 
+index_regions_preflight_data_path <- file.path(preflight_data_path, "index_regions.rds")
 
 # computed options -------------------------------------------------------------
 
@@ -157,10 +164,16 @@ if (update_currencies) {
   currencies <- pacta.data.scraping::get_currency_exchange_rates(
     quarter = imf_quarter_timestamp
   )
+  saveRDS(currencies, currencies_preflight_data_path)
+} else {
+  logger::log_info("Using pre-existing currency data.")
+  # This requires the preflight path to be defined in the config
+  currencies <- readRDS(currencies_preflight_data_path)
 }
 
 logger::log_info("Scraping index regions.")
 index_regions <- pacta.data.scraping::get_index_regions()
+saveRDS(index_regions, index_regions_preflight_data_path)
 
 logger::log_info("Fetching pre-flight data done.")